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let mut cursor = btree::cursor::Cursor::new(txn, graph).map_err(|x| BlockError::Txn(x))?;
let mut k = if let Some((k, _)) = cursor
.set(txn, &key, None)
.map_err(|x| BlockError::Txn(x))?
{
let mut cursor = btree::cursor::Cursor::new(txn, graph).map_err(BlockError::Txn)?;
let mut k = if let Some((k, _)) = cursor.set(txn, &key, None).map_err(BlockError::Txn)? {
PrintableAtom::NewVertex(x) => {
Box::new(x.shrink().map(|x| PrintableAtom::NewVertex(x)))
}
PrintableAtom::Edges(x) => Box::new(x.shrink().map(|x| PrintableAtom::Edges(x))),
PrintableAtom::NewVertex(x) => Box::new(x.shrink().map(PrintableAtom::NewVertex)),
PrintableAtom::Edges(x) => Box::new(x.shrink().map(PrintableAtom::Edges)),