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    "You think you do, but you don't." -J Allen Brack

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    It seems there's something wrong with the hidden tests.
    I was getting random failures like (notice the "-+" in the expected string, which seems to me like an invalid thing):

    Falsifiable (after 58 tests):
    expected: "-+5b+6x-17ad+cx-cy-10dz-5abd-8aby+6acx-acz+12adz-15bcy-5bcz-8byz-9cdy+6cxz-cyz-14abcd-abcy-18abdy+4abyz-12acdz-14acxz-5acyz+adxy+9bcdy-5bcxy-10bcxz-8bcyz+11bdxy+4cdxy-15cdyz+8dxyz-2abcdz-14abcxy+11abdxy-12abdyz-7adxyz-2bcdxz-10bcdyz-4bdxyz+7abdxyz-7abcdxyz"