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####
##
## Take a certain number of networks as input and give as output the
## corresponding intersection graph, i.e. the graph in which an edge
## exists between i and j if and only if it exists in ALL the graphs
## given as input
##
import sys
if len(sys.argv)< 3:
print "Usage: %s <file1> <file2> [<file3>....]" % sys.argv[0]
sys.exit(1)
graphs = {}
num = 0
for fname in sys.argv[1:]:
lines = open(fname).readlines()
graphs[num] = []
for l in lines:
s,d = [int(x) for x in l.strip(" \n").split(" ")][:2]
if s > d:
graphs[num].append((d,s))
else:
graphs[num].append((d,s))
num += 1
#print graphs
for edge in graphs[0]:
to_print = True
for i in range(1, num):
if edge not in graphs[i]:
to_print = False
break
if to_print:
s,d = edge
print s,d
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