Little Professor (Python pset4) only handles data generated in specific order

[TwistedCrusader]

The tests for professor are currently relying and expecting students' solutions to generate x and y values in a certain order; specifically, x0, y0, x1, ect. In this case the first level 1 question will be 6 + 6

It does not handle the case where the student generates all their x values first, then y values, e.g. x0, x1, x2 .... y0, y1, In this case the first level 1 question will be 6 + 9

Are there any other orders that students may use?