Four Fours/171

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $171$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$171 = \dfrac {\map \Gamma {\map \Gamma 4} } {\sqrt {. \dot 4} } - \dfrac 4 {. \dot 4}$

Also see

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