static boolean isBST ( Node root ) {
  return isBSTUtil ( root ) ;
}

static boolean isBST ( Node root ) { return isBSTUtil ( root ) ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (return_statement (method_invocation name: (identifier) arguments: (argument_list (identifier))))))