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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/modifierleftoperand.html).*

# Mathematical Double-struck F (`𝔽`)

## `𝔽`: Modifier Left operand

A variable assigned to the left operand of a modifier block. `𝕗` can be used to access the left operand as a subject.

        5 +{𝕗⊣𝕨} 1