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[12,2,2,w,3,3,s,s,s,] maps to [1*12,2*2,1*w,2*3,3*s]

runcode([],C,N,[N*C]).
runcode([H | T],H,N,Z) :- N1 is N+1,runcode(T,H,N1,Z).
runcode([H | T],C,N,[N*C| Z]) :- H\==C,runcode(T,H,1,Z).