The moment we add C we generate ample material to avoid repetition. First, to the three possible relationships between A and B: positive/negative/neutral, love/hate/indifference, for example, we add the same three between A and C and between B and C. This gives us nine possibilities. Then we may join A and B against C; A and C against B; B and C against A. Or put them all in love or all in hate or all indifferent. By adding a third corner, the triangle breeds over twenty variations, more than enough material to progress without repetition.
