| app | : | [list × list] ⟶ list |
| cons | : | [nat × list] ⟶ list |
| map | : | [nat → nat × list] ⟶ list |
| nil | : | list |
| reverse | : | [list] ⟶ list |
| shuffle | : | [list] ⟶ list |
| X | : | list |
| Y | : | nat |
| U | : | list |
| V | : | list |
| W | : | nat |
| P | : | list |
| X1 | : | nat |
| Y1 | : | list |
| G1 | : | nat → nat |
| H1 | : | nat → nat |
| W1 | : | nat |
| P1 | : | list |
| app(nil, X) | ⇒ | X |
| app(cons(Y, U), V) | ⇒ | cons(Y, app(U, V)) |
| reverse(nil) | ⇒ | nil |
| reverse(cons(W, P)) | ⇒ | app(reverse(P), cons(W, nil)) |
| shuffle(nil) | ⇒ | nil |
| shuffle(cons(X1, Y1)) | ⇒ | cons(X1, shuffle(reverse(Y1))) |
| map(G1, nil) | ⇒ | nil |
| map(H1, cons(W1, P1)) | ⇒ | cons(H1 · W1, map(H1, P1)) |