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## Strings

`((draw-string viewport) p string color)`
Takes a viewport descriptor. It returns a function that draws a string at a specified location in the viewport. The lower left of the string begins at p. The optional color argument defaults to black.

`((clear-string viewport) p string)`
Takes a viewport descriptor. It returns a function that clears a string at a specified location in viewport. The lower left of the string begins at p.

`((flip-string viewport) p string)`
Takes a viewport descriptor. It returns a function that flips a string at a specified location in viewport. The lower left of the string begins at p.