View Compilation Error

0_0_30403159_6459.cpp: In function 'll get(ll, ll, ll)':
0_0_30403159_6459.cpp:212:95: error: 'r2' was not declared in this scope
  a = exp_mod(v,exp_mod(t1,x, mod - 1) * exp_mod(t2,y, mod - 1) % (mod - 1) * r1 % (mod - 1) * r2 % (mod - 1));
                                                                                               ^