def copy(l):
l2=[]
for x in l:
l2.append(x)
return l2
def loops(d):
l=[]
for x in d:
l.append(x)
lreq=[]
lreq2=[]
ltemp=[]
for x in l:
ltemp=[]
ltemp.append(x)
lreq2.append(ltemp)
t=1
while (t<=(len(l)-1)):
lreq3=[]
for x in lreq2:
ltemp=copy(l)
for y in x:
ltemp.remove(y)
for y in ltemp:
h=copy(x)
if y in d[x[-1]]:
h.append(y)
lreq3.append(h)
if t>=2:
for x in lreq3:
if x[0] in d[x[-1]]:
h=copy(x)
h.append(h[0])
lreq.append(h)
lreq2=copy(lreq3)
t+=1
for x in lreq:
for y in lreq[(lreq.index(x)+1):]:
if set(x)==set(y):
lreq.remove(y)
return lreq
