Function: kkc-region

Convert Kana string in the current region to Kanji-Kana mixed string.
Users can select a desirable conversion interactively.
When called from a program, expects two arguments,
positions FROM and TO (integers or markers) specifying the target region.
When it returns, the point is at the tail of the selected conversion,
and the return value is the length of the conversion. (fn FROM TO)