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u2 = ar
u10 = ar^9
ar^9 = a^52
a²r^9 = a^52
r^9 = a^50
9log r = 50log a
r = a^50/9
u2 = ar
u2 = a².a^50/9
u² = a(2+ 50/9)
u² = a^(68/9)