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View Compilation Error

0_0_33645674_21184.cpp: In function 'int main()':
0_0_33645674_21184.cpp:7:13: error: 'a1' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
             ^
0_0_33645674_21184.cpp:7:17: error: 'a2' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                 ^
0_0_33645674_21184.cpp:7:21: error: 'b1' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                     ^
0_0_33645674_21184.cpp:7:25: error: 'b2' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                         ^
0_0_33645674_21184.cpp:7:29: error: 'c1' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                             ^
0_0_33645674_21184.cpp:7:33: error: 'c2' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                                 ^
0_0_33645674_21184.cpp:7:37: error: 'd1' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                                     ^
0_0_33645674_21184.cpp:7:41: error: 'd2' was not declared in this scope
  while(cin>>a1>>a2>>b1>>b2>>c1>>c2>>d1>>d2)
                                         ^


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