Our friend the list

?- append([1,2,3],[4,5],L). L=[1,2,3,4,5]

?- append([1,2],M,[1,2,3]). M=[3]

?- append(A,B,[1,2]). A=[], B=[1,2]

A=[1], B=[2] A=[1,2], B=[]

• append works in multiple directions!

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