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Find the rule

Otherwise why do you not want us to start with anything higher than 4?
Ok let's start mine.
Instead of giving an example I give a property.
if (a,b,c) is a non-acceptable sequence, so does: any permutation of (a,b,c), namely (a,c,b) (b,a,c), (b,c,a),(c,a,b),(c,b,a)

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