4 is magic

Logic Level 2

\[ \text{3 is 5, 5 is 4, and 4 is magic} \\ \text{21 is 9, 9 is 4, and 4 is magic.} \\ \text{15 is 7, 7 is 5, 5 is 4, and 4 is magic.} \\ \boxed{\text{101 is 13, 13 is 8, 8 is ?}} \]

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