() Xue Fuqiao <xfq.free@gmail.com>
() Wed, 10 Apr 2013 21:46:27 +0800

   I don't know what "set bits" means here.

See <http://foldoc.org/bit>, which defines "set"
(and "clear") with respect to a "bit".

M-x praise-foldoc RET

-- 
Thien-Thi Nguyen
GPG key: 4C807502