720

{a, i, m, r, t, x} | {a, i, m, r, x, t} | {a, i, m, t, r, x} | {a, i, m, t, x, r} | {a, i, m, x, r, t} | {a, i, m, x, t, r} | {a, i, r, m, t, x} | {a, i, r, m, x, t} | {a, i, r, t, m, x} | {a, i, r, t, x, m} | {a, i, r, x, m, t} | {a, i, r, x, t, m} | {a, i, t, m, r, x} | {a, i, t, m, x, r} | {a, i, t, r, m, x} | {a, i, t, r, x, m} | {a, i, t, x, m, r} | {a, i, t, x, r, m} | {a, i, x, m, r, t} | {a, i, x, m, t, r} | ... (total: 720)