Hint: The four symbols seem to occur in the same cyclic order. From one instance to the next, count the number of quarter rotations needed.
– hardmathAug 03 '19 at 15:23
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It looks like every next picture is the previous one rotated clockwise by 1/4 then 2/4, then 3/4... The unknown I expect to be rotated 4/4, i.e. coincide with the last one.