[41/42/..] Micro-challenge: order X and Y by magnitude

[Werner]

Really very small challenge. Given two numbers in X and Y, order them so that the smallest in magnitude is in X. To make it a bit more of a challenge, you can only use the stack, and must leave L, Z and T untouched.
Basically, perform a X<>Y when abs(X) > abs(Y).
When the magnitudes are equal, you have a choice.
BTW should you need a test
X>=a?
where a=0 or Y, present on the 42S but not on the 41, do
X<a?
X=a?
instead, in succession.

Good luck, Werner