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 SACHOICE()

 -[nMRow, nMCol]  (new in 3.5) Directs sachoice() to draw
  the "[.][.]" for mouse up/down at nMrow, nMCol, and to be aware of mouse
  clicks on these buttons. (the screen under the arrows is saved/restored)

 -[bMouse] is a codeblock to evaluate mouse clicks other than those
  meaningful to sachoice(). The codeblock is evaluated as follows:
            eval(bMouse,mouserow, mousecolumn)