l1: {A,B,C},{D,E,F} l2: {a,b},{c,d},{e,f} externally looks like: [] <- {A,B,C,a,b} [] <- {A,B,C,c,d} [] <- {A,B,C,e,f} [] <- {D,E,F,a,b} [] <- {D,E,F,c,d} [] <- {D,E,F,e,d} but internally is: A,B,C,a,b,A,B,C,c,d,A,B,C,e,f,D,E,F,a,b,D,E,F,c,d,D,E,F,e,d@author jhyde
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