[eqn] Maps to symbol

[Nguyễn Gia Phong via discussion of the GNU roff typesetting system and related software]

Hi,

I want to be able to typeset the maps to symbol in arrow notation,
e.g. n ↦ n + 1.  The Unicode code point for the character is U+21A6.

Please let me know what I can do to make it happen.

Cheers,
Phong

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