2: Add solutions for section "functions".

Created by  Aaw9nJhsNmfzFih9mKyNw9mV8CgERXJkRa1kK1Kx3LQH  on August 6, 2021
HFKSXH64KNUG7IAEUGLEIEHAKBFCTTZECEHXTBE44G2P2AIAWD4QC
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