Sketch docs for computation on [gmap], since they're a FAQ

TODO:

• fix line breaks, when the rest is reviewed (it destructs diffs till then).

Thanks for the MR. Left some comments.

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• 93359b14 - Address some comments

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changed the description

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• 94288cec - Try addressing other comments

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Tried to address all comments.

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• 3932aeec - You need both

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• 2c6d848c - Document why [simpl never] is not enough

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• 312439ab - Add forward reference

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• e97a1b43 - Link to alternative design.

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resolved all threads

I'll squash and fix line-breaks to 80 columns (right?) after I get LGTMs from both :-)

I'll squash and fix line-breaks to 80 columns (right?) after I get LGTMs from both :-)

LGTM

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• 52b33b68 - no contractions

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