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import Maker from '@makerdao/dai';

  const maker = 
    await Maker.create('http', {
    url: myRpcUrl,
    privateKey: myPrivateKey
  });

  const vault = 
    await maker
      .service('mcd:cdpManager')
      .openLockAndDraw(
        'ETH-A', ETH(50), DAI(1000)
      );