Add definition for numbers and add description
authorMichael Wang <michaelwang9000@gmail.com>
Thu, 19 Jan 2017 05:02:04 +0000 (21:02 -0800)
committerMichael Wang <michaelwang9000@gmail.com>
Tue, 21 Feb 2017 20:40:26 +0000 (12:40 -0800)

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