How do I multiply all elements in one collection with all the elements in another collection?

Question

Say I have:

(def s1 [1 2 3 4 5])
(def s2 [1 2 3 4 5])

For every x in s1, I want to multiply it with every y in s2.

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To clarify, I basically want the Cartesian product, so I don't think map works here.

Answer 1

(for [x1 s1
      x2 s2]
  (* x1 x2))