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+.SS Keyboard commands
+.
+.TP
+.B Shift-q
+Quit.
+.
+.TP
+.B [0..9]
+Enter a digit into the input buffer.
+pfc works with floating point numbers so the
+.B .
+character is OK as well.
+.
+.TP
+.B Backspace
+Remove a digit from the input buffer.
+.
+.TP
+.B Enter
+Push the number in the input buffer to the stack.
+.
+.TP
+.B Shift-j
+Swap the bottom (most recently pushed) item on the stack with the input buffer.
+If the input buffer is empty this simply moves the most recently pushed item
+back into the input buffer.
+.
+.TP
+.B Shift-k
+The same as
+.BR Shift-j .
+.
+.TP
+.B Shift-d
+Delete the contents of the input buffer.
+.
+.TP
+.B Shift-c
+Delete the contents of the input buffer and the stack.
+.
+.TP
+.B Shift-a
+Toggle between degree and radian mode.
+.
+.TP
+.B Shift-n
+Negation. If there is a number in the buffer, negate it. Otherwise, negate the
+bottom number in the stack.