comefrom: <awangdev>311. Sparse Matrix Multiplication_3.java
code: private boolean validate(int[][] A, int[][] B) {
  
          if (A == null || B == null) return true;
          if (A[0].length != B.length) return true;
          return false;
      }
masked: private boolean var_0 ( int [ ] [ ] var_1 , int [ ] [ ] var_2 ) {
    if ( var_1 == null || var_2 == null ) return true ;
    if ( var_1 [ 0 ] . length != var_2 . length ) return true ;
    return false ;
  }
  