"A includes B and C" could mean that A is made up of B, C, and possibly other things. For example, a cake batter (A) could include flour (B) and sugar (C). It could also include eggs (D). "A consists of B and C" means that B and C are the only components of A. For example, a glue (A) might consist of flour (B) and water (C). More @Wikipedia
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