def _get_i(mon):
"""$R_{ij}<R_{kl}$ if (j-i, i)<(l-k,k)"""
for i in range(len(mon)):
if DualSteenrodDense.is_gen_E0(mon[i]):
if i > 0 and (len(mon[i]), mon[i][-1]) < (len(
mon[i - 1]), mon[i - 1][-1]):
return i - 1
else:
if i > 0 and all(
(g + 1, 1 << s) < (len(mon[i - 1]), mon[i - 1][-1])
for g, e in enumerate(mon[i]) if e > 0
for s in two_expansion(e)):
return i - 1
else:
break
return None
def key_mon(mon):
return [(DualSteenrodDense.is_gen_E0(m), len(m), m[-1]) for m in mon]