Let´s say that we want to multiply four square matrices, described as:

A(i,j)
B(j,n)
C(n,m)
D(m,w)

i and j are declared normally at the beginning of the program, but the other indices have to use alias:

alias (n,i)
alias (m,j)
alias (w,n)

So, the sentence has to be written as follows:

multiplication(i,w).. sum((m,n,j),A(i,j)*B(j,n)*C(n,m)*D(m,w));

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