HP48 programming: use values from stack in expression

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Hello all

I'm trying to write a simple program for the HP48. The program should take two values from the stack and put an expression back on the stack that contains these values. For example: take 2 and 3 and return '2+3'.

With 2 and 3 as input, I tried << -> a b 'a+b' >> which returns 5 and << -> a b << 'a+b' >> >> which returns 'a+b'. And << -> a b << 'a+b' EVAL >> >> returns 5 again (of course)...

Thanks for any help!
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