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Pass Criteria

The test passes if, for the first four seconds of the document, each of the four purple circles moves along the dashed lines such that they coincide with the gray circles at the times indicated next to those gray circles. The purple circles must all move continuously over the four seconds, except for the top-right one, which jumps discontinuously at 2s from the second grey circle to the third in that subtest.

If a range of times is given next to a grey circle, then the purple circle must stay stationary at that position for that duration.