Sequelizejs HasMany trernary relationship

Question

I want to make a triple bond in Sequelize, as shown in the image below

Image https://www.dropbox.com/s/v8bgsir2qqw6ccv/relationship%20.jpg

If I apply this code in sequelize

A.hasMany(B);
A.hasMany(C);
B.hasMany(C);
C.hasMany(A);
C.hasMany(B);

The resulting SQL code is as follows

CREATE TABLE IF NOT EXISTS `a_b_` (
  PRIMARY KEY (`BId`,`AId`)
) 
CREATE TABLE IF NOT EXISTS `a_c_` (
  `CId` int(11) NOT NULL DEFAULT '0',
  `AId` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`CId`,`AId`)
) 
CREATE TABLE IF NOT EXISTS `b_c_` (
  PRIMARY KEY (`CId`,`BId`)
)

But the result should be

 CREATE TABLE IF NOT EXISTS `a_b_` (
  PRIMARY KEY (`BId`,`AId`)
) 
CREATE TABLE IF NOT EXISTS `a_b_c_` (
  `AId` int(11) NOT NULL DEFAULT '0',
  `BId` int(11) NOT NULL DEFAULT '0', 
  `CId` int(11) NOT NULL DEFAULT '0',

  PRIMARY KEY (`AId`,`BId`, 'CId')
) 

I just can't create a table with pk (AId, BId, CId), someone can tell me where to go or what I can do.

Many thanks.