static long countPairs ( int m , int n ) {
  long ans = fact ( 2 * m + n - 1 ) / ( fact ( n - 1 ) * fact ( 2 * m ) ) ;
  return ( ans % mod ) ;
}

static long countPairs ( int m , int n ) { long ans = fact ( 2 * m + n - 1 ) / ( fact ( n - 1 ) * fact ( 2 * m ) ) ; return ( ans % mod ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)) right: (decimal_integer_literal)))) right: (parenthesized_expression (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (decimal_integer_literal) right: (identifier))))))))) (return_statement (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))