i( [],_,0 ).
i( _,[],0 ).
i
( [A
|R
],[A
|S
],W
) :- i
( R
,S
,P
), W
is P
+ 1.i
( [_
|R
],[_
|S
],W
) :- i
( R
,S
,P
), W
is P
.
i( [1,2,3,4],[1,3,2,4],I ).
i( [1,2,3,4],[1,2,3,4],I ).
i( [4,3,2,1],[1,2,3,4],I ).
i( [1,1,1,1],[2,2,2,2],I ).
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