| n < # wlar ⊦ bflipset-cons(bflipset, subarray(wlar, 0, n)) ∧ n0 < n → bflipset-cons(bflipset -- n0, subarray(wlar[n, wl-entry(m0, used)][n0, wl-entry(m1, erasing)], 0, n + 1)) |
n0 < n, n < # wlar, bflipset-cons(bflipset, subarray(wlar, 0, n)) ⊦ bflipset-cons(bflipset -- n0, subarray(wlar[n, wl-entry(m0, used)][n0, wl-entry(m1, erasing)], 0, n + 1))