This sequence involves musical solfeggio notes (DO, RE, MI, FA, SOL,...). First group everything into groups of 2. The first number signifies solfeggio notes from 1 to 8(1= DO, 2= RE, 3= MI, 4= FA, ... 8= DO). The second number signifies the number of letters in the standard way of writing the solfeggio note. Thus, for the first pair (5,3) 5= SOL, and SOL has 3 letters. Thus, all the unknowns are the number 2.
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