@@ -53,6 +53,9 @@ l1> ?- p(Z, h(Z, w), f(Z)).
yes
l1> ?- p(z, h(Z, w), f(Z)).
no
l1> p(f(X), h(Y, f(a)), Y).
l1> ?- p(Z, h(Z, W), f(W)).
l1> quit
```
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