>>12
{A〜Y} = {2,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89}
とすると
 Z = 193,

{ A, B, C } =
89, 73, 31
89, 67, 37
89, 61, 43
83, 79, 31
83, 73, 37
83, 67, 43
79, 73, 41
79, 71, 43
79, 67, 47
79, 61, 53
73, 67, 53
73, 61, 59

{ D, E, F, G } =
89, 83, 19, 2
89, 79, 23, 2
89, 73, 29, 2
89, 71, 31, 2
89, 61, 41, 2
89, 59, 43, 2
83, 79, 29, 2
83, 71, 37, 2
83, 67, 41, 2
83, 61, 47, 2
79, 71, 41, 2
79, 59, 53, 2
73, 71, 47, 2
71, 67, 53, 2
71, 61, 59, 2

2 ∈ {M,N,O,P,Q,R}

このあと、どうするか?