This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
n=int(input())
k=[[[[False for i in range(26)]for j in range(26)]for m in range(26)]for _ in range(26)]
c=[]
t=0
v=[[[0,0]for _ in range(26)]for _ in range(26)]
h=[[[0,0]for _ in range(26)]for _ in range(26)]
for i in range(n):
a=input()
b=input()
k[ord(a[0])-65][ord(a[1])-65][ord(b[0])-65][ord(b[1])-65]=True
v[ord(a[0])-65][ord(b[0])-65][0]+=1
v[ord(a[1])-65][ord(b[1])-65][1]+=1
h[ord(a[0])-65][ord(a[1])-65][0]+=1
h[ord(b[0])-65][ord(b[1])-65][1]+=1
for i in range(26):
for j in range(26):
t+=h[i][j][0]*h[i][j][1]
t+=v[i][j][0]*v[i][j][1]
print(t)
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