| (r ' + x1).last = x.last, (r0 ' + x0).last = x.last, path(r ' + x1, H), path(r ' + x1 + r2 ' + (x + H[r0].nxt ') + r0 ', H), path(r ' + x1 + r2 ' + x + H[r0].nxt ', H), path(r0 ' + x0, H), x.last ∈ H, r0 ∈ H, H[r0].nxt ∈ H ⊦ H[r0].nxt = null, r = H[r0].nxt, r = r2, r0 = H[r0].nxt, r0 = r, r2 = H[r0].nxt, r2 = r0, x = [], dups(x), dups(x1), dups(x1 + x), dups(x0), H[r0].nxt ∈ x1, H[r0].nxt ∈ x, r0 ∈ x, r2 ∈ x1, r2 ∈ x, r0 ∈ x1, r ∈ x, r ∈ x1, r0 ∈ x0 |
(r0 ' + x0).last = x.last, (r ' + x1).last = x.last, path(r0 ' + x0, H), path(r ' + x1 + r2 ' + x + H[r0].nxt ', H), path(r ' + x1 + r2 ' + (x + H[r0].nxt ') + r0 ', H), path(r ' + x1, H), H[r0].nxt ∈ H, r0 ∈ H, x.last ∈ H ⊦ H[r0].nxt = null, r = r2, r = H[r0].nxt, r0 = r, r0 = H[r0].nxt, r2 = r0, r2 = H[r0].nxt, x = [], dups(x0), dups(x1 + x), dups(x1), dups(x), r0 ∈ x0, r ∈ x1, r ∈ x, r0 ∈ x1, r2 ∈ x, r2 ∈ x1, r0 ∈ x, H[r0].nxt ∈ x, H[r0].nxt ∈ x1