Can anyone find what's wrong in my program for parenting partners returns
problem
z=int(input())
for zz in range(1,z+1):
n=int(input())
l=[]
out='C'
for i in range(n):
t=list(map(int,input().split()))
l.append(t)
c=set(range(l[0][0],l[0][1]))
j=set()
for i in l[1:]:
t=set(range(i[0],i[1]))
if len(c.intersection(t))==0:
out+='C'
c.update(t)
elif len(j.intersection(t))==0:
out+='J'
j.update(t)
else:
out="IMPOSSIBLE"
break
print("Case #{}: {}".format(zz,out))
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