static int sameRemainder ( int a , int b , int c ) {
  int a1 = ( b - a ) , b1 = ( c - b ) , c1 = ( c - a ) ;
  return gcd ( a1 , gcd ( b1 , c1 ) ) ;
}

static int sameRemainder ( int a , int b , int c ) { int a1 = ( b - a ) , b1 = ( c - b ) , c1 = ( c - a ) ; return gcd ( a1 , gcd ( b1 , c1 ) ) ; }
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