Explanation:
b = 4`² = 1/16 = 0.0625
c = 4`⁴ = 1/256 = 0.00390625
d = (⅔)° = 1
e = (⅔)² = 4/9 = 0.4444...
f = (⅔)⁴ = 16/81 = 0.197530864
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