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Clear: Easy way to reset calculator. Clears graph of equations and
drawings, resets range, erases Y variables and stat registers, and inputs
common numbers into variables.

PGRM:CLEAR
ClrHome
ClrStat
ClrDraw
-10 -> Xmin
10 -> Xmax
-10 -> Ymin
10 -> Ymax
" " -> Y1
" " -> Y2
" " -> Y3
" " -> Y4
6.7E11 ->G
8.31 ->R