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+Rip -- a stack-based rip language
+=================================
+
+All stack items are integers, of unspecified but constant size
+
+0-9: push value
+p: pop
+s: swap
+D: duplicate
+i: increment
+d: decrement
+r: pops the number of items to rotate clockwise
++ - * /: just what you expect
+> < =: comparisons; booleans are 1 and 0, as you expect
+[ ... ]: syntactical; a codeblock
+I: pops boolean, conditionally executing the codeblock that should follow the I, depending on the boolean (aka "if")
+W: I, but then "while" instead of "if"
+o: outputs the top value as an ascii char
+O: outputs the top value as a number
+whitespace: nop
+
+
+Any error causes the interpreter to exit, saying "rip".
+
+
+Example code
+------------
+
+Fibonacci:
+
+01
+1W[
+	DO
+	9io
+	D3r+
+1]