def interlock(l):
for i in l:
x = y = ''
if (len(i)%2 == 0):
for j in range(len(i)):
if j%2 == 0:
x += i[j]
else:
y += i[j]
if (ex_10_11.bisect(l, x) != -1) and (ex_10_11.bisect(l, y) != -1):
print x, y, i
def interlock3(l):
for i in l:
x = y = z = ''
if (len(i)%3 == 0):
for j in range(len(i)):
if j%3 == 0:
x += i[j]
elif j%3 == 1:
y += i[j]
else:
z += i[j]
if (ex_10_11.bisect(l, x) != -1) and (ex_10_11.bisect(l, y) != -1) and (ex_10_11.bisect(l, z) != -1):
print x, y, z, i
def reverse_pair(l):
c = 0
for i in l:
s = i[::-1]
if ex_10_11.bisect(l, s) != -1:
c += 1
print i, s
print c
