subsequence (list1,list2) is satisfied if the elements of list1 occur in the same order in list 2 . That means that whenevr x precedes y in list 1 x occurs before y in list2. fro example subsequence ([a,b,c],[1,a,2,3,b,4,5,c,6]) is satisfied becuase in the second list a occurs before b and b...
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