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Refer to the following data:

le(x, y) = | least of(x, y)

mo(x) = |x| me(x)

(x, y) = maximum of(x, y)

Which of the following must be correct?

  1. mo(le(a, b)$^{3}$ (me(mo(a), mo(b))
  2. mo(le(a, b)) > (me(mo(a), mo(b))
  3. mo(le(a, b)) < (le(mo(a), mo(b))
  4. mo(le(a, b)) le(mo(a), mo(b))
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