public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int t = scanner . nextInt ( ) , i , j , k , count ;
  for ( int f = 0 ;
  f < t ;
  f ++ ) {
    int n = scanner . nextInt ( ) ;
    k = 0 ;
    count = 0 ;
    int a [ ] = new int [ n ] ;
    int b [ ] = new int [ n * n ] ;
    for ( i = 0 ;
    i < n ;
    i ++ ) {
      a [ i ] = scanner . nextInt ( ) ;
    }
    for ( i = 0 ;
    i < n ;
    i ++ ) {
      for ( j = i + 1 ;
      j < n ;
      j ++ ) {
        b [ k ] = a [ j ] - a [ i ] ;
        k ++ ;
      }
    }
    for ( i = 0 ;
    i < k ;
    i ++ ) {
      if ( b [ i ] != - 1 ) {
        count ++ ;
        for ( j = i + 1 ;
        j < k ;
        j ++ ) {
          if ( b [ i ] == b [ j ] ) {
            b [ j ] = - 1 ;
          }
        }
      }
    }
    System . out . println ( count ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int t = scanner . nextInt ( ) , i , j , k , count ; for ( int f = 0 ; f < t ; f ++ ) { int n = scanner . nextInt ( ) ; k = 0 ; count = 0 ; int a [ ] = new int [ n ] ; int b [ ] = new int [ n * n ] ; for ( i = 0 ; i < n ; i ++ ) { a [ i ] = scanner . nextInt ( ) ; } for ( i = 0 ; i < n ; i ++ ) { for ( j = i + 1 ; j < n ; j ++ ) { b [ k ] = a [ j ] - a [ i ] ; k ++ ; } } for ( i = 0 ; i < k ; i ++ ) { if ( b [ i ] != - 1 ) { count ++ ; for ( j = i + 1 ; j < k ; j ++ ) { if ( b [ i ] == b [ j ] ) { b [ j ] = - 1 ; } } } } System . out . println ( count ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (identifier)))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (for_statement init: (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))) (expression_statement (update_expression (identifier))))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (block (expression_statement (update_expression (identifier))) (for_statement init: (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (unary_expression operand: (decimal_integer_literal)))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))