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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; This file is part of hnefatafl-copenhagen.</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F;</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; hnefatafl-copenhagen is free software: you can redistribute it and&#x2F;or modify</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; it under the terms of the GNU Affero General Public License as published by</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; the Free Software Foundation, either version 3 of the License, or</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; (at your option) any later version.</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F;</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; hnefatafl-copenhagen is distributed in the hope that it will be useful,</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; but WITHOUT ANY WARRANTY; without even the implied warranty of</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; GNU Affero General Public License for more details.</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F;</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; You should have received a copy of the GNU Affero General Public License</pre>
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                <pre class="has-background-white py-0 px-2">&#x2F;&#x2F; along with this program.  If not, see &lt;https:&#x2F;&#x2F;www.gnu.org&#x2F;licenses&#x2F;&gt;.</pre>
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                <pre class="has-background-white py-0 px-2">use std::collections::VecDeque;</pre>
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                <pre class="has-background-white py-0 px-2">use crate::{</pre>
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                <pre class="has-background-white py-0 px-2">    board::{Board, BoardSize},</pre>
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                <pre class="has-background-white py-0 px-2">    game::PreviousBoards,</pre>
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                <pre class="has-background-white py-0 px-2">    play::Plays,</pre>
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                <pre class="has-background-white py-0 px-2">    role::Role,</pre>
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                <pre class="has-background-white py-0 px-2">};</pre>
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                <pre class="has-background-white py-0 px-2">#[derive(Clone, Debug)]</pre>
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                <pre class="has-background-white py-0 px-2">pub struct Tree {</pre>
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                <pre class="has-background-white py-0 px-2">    node: usize,</pre>
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                <pre class="has-background-white py-0 px-2">    pub next_child: usize,</pre>
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                <pre class="has-background-white py-0 px-2">    arena: Vec&lt;Node&gt;,</pre>
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                <pre class="has-background-white py-0 px-2">}</pre>
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                <pre class="has-background-white py-0 px-2">impl Tree {</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn next_child(&amp;mut self) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.next_child += 1;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        if self.next_child &gt;= self.arena[self.node].children.len() {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            self.next_child = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn backward(&amp;mut self) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        if let Some(node) = self.arena[self.node].parent {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            self.node = node;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.next_child = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn backward_all(&amp;mut self) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut node = self.node;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        while let Some(node_index) = self.arena[node].parent {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            node = node_index;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.next_child = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.node = node;</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn forward(&amp;mut self) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        if !self.arena[self.node].children.is_empty() {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            self.node = self.arena[self.node].children[self.next_child];</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.next_child = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn forward_all(&amp;mut self) -&gt; usize {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut node = self.node;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut count = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        while !self.arena[node].children.is_empty() {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            node = self.arena[node].children[self.next_child];</pre>
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                <pre class="has-background-danger-light py-0 px-2">            count += 1;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.next_child = 0;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.node = node;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        count</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn has_children(&amp;self) -&gt; bool {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        !self.arena[self.node].children.is_empty()</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn insert(&amp;mut self, board: &amp;Board) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let index = self.arena.len();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let node = &amp;mut self.arena[self.node];</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.node = index;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let old_index = node.index;</pre>
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                <pre class="has-background-danger-light py-0 px-2">        node.children.push(index);</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let turn = node.turn.opposite();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.arena.push(Node {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            index,</pre>
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                <pre class="has-background-danger-light py-0 px-2">            board: board.clone(),</pre>
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                <pre class="has-background-danger-light py-0 px-2">            turn,</pre>
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                <pre class="has-background-danger-light py-0 px-2">            parent: Some(old_index),</pre>
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                <pre class="has-background-danger-light py-0 px-2">            children: Vec::new(),</pre>
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                <pre class="has-background-danger-light py-0 px-2">        });</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn here(&amp;self) -&gt; Node {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.arena[self.node].clone()</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn here_board(&amp;self) -&gt; Board {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        self.arena[self.node].board.clone()</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn new(board_size: BoardSize) -&gt; Self {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        Self {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            node: 0,</pre>
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                <pre class="has-background-danger-light py-0 px-2">            next_child: 0,</pre>
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                <pre class="has-background-danger-light py-0 px-2">            arena: vec![Node {</pre>
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                <pre class="has-background-danger-light py-0 px-2">                index: 0,</pre>
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                <pre class="has-background-danger-light py-0 px-2">                board: Board::new(board_size),</pre>
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                <pre class="has-background-danger-light py-0 px-2">                turn: Role::Attacker,</pre>
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                <pre class="has-background-danger-light py-0 px-2">                parent: None,</pre>
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                <pre class="has-background-danger-light py-0 px-2">                children: Vec::new(),</pre>
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                <pre class="has-background-danger-light py-0 px-2">            }],</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">    #[must_use]</pre>
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                <pre class="has-background-danger-light py-0 px-2">    pub fn previous_boards(&amp;self) -&gt; (Plays, PreviousBoards) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut node = &amp;self.here();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut previous_boards = PreviousBoards::new(node.board.size());</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut boards = VecDeque::new();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let mut plays = Vec::new();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        previous_boards.0.insert(node.board.clone());</pre>
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                <pre class="has-background-danger-light py-0 px-2">        boards.push_front(node.board.clone());</pre>
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                <pre class="has-background-danger-light py-0 px-2">        while let Some(parent) = node.parent {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            node = &amp;self.arena[parent];</pre>
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                <pre class="has-background-danger-light py-0 px-2">            previous_boards.0.insert(node.board.clone());</pre>
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                <pre class="has-background-danger-light py-0 px-2">            boards.push_front(node.board.clone());</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let boards: Vec&lt;_&gt; = boards.iter().collect();</pre>
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                <pre class="has-background-danger-light py-0 px-2">        for windows in boards.windows(2) {</pre>
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                <pre class="has-background-danger-light py-0 px-2">            let board_1 = windows[0];</pre>
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                <pre class="has-background-danger-light py-0 px-2">            let board_2 = windows[1];</pre>
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                <pre class="has-background-danger-light py-0 px-2"></pre>
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                <pre class="has-background-danger-light py-0 px-2">            let play = board_1.difference(board_2);</pre>
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                <pre class="has-background-danger-light py-0 px-2">            plays.push(play);</pre>
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                <pre class="has-background-danger-light py-0 px-2">        }</pre>
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                <pre class="has-background-danger-light py-0 px-2">        let plays = Plays::PlayRecords(plays);</pre>
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                <pre class="has-background-danger-light py-0 px-2">        (plays, previous_boards)</pre>
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                <pre class="has-background-danger-light py-0 px-2">    }</pre>
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                <pre class="has-background-white py-0 px-2">}</pre>
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                <pre class="has-background-white py-0 px-2">#[derive(Clone, Debug, PartialEq, Eq)]</pre>
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                <pre class="has-background-white py-0 px-2">pub struct Node {</pre>
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                <pre class="has-background-white py-0 px-2">    index: usize,</pre>
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                <pre class="has-background-white py-0 px-2">    pub turn: Role,</pre>
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                <pre class="has-background-white py-0 px-2">    parent: Option&lt;usize&gt;,</pre>
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                <pre class="has-background-white py-0 px-2">    children: Vec&lt;usize&gt;,</pre>
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                <pre class="has-background-white py-0 px-2">}</pre>
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                <p class="heading">Date: 2026-01-28 15:49</p>
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