(∃a)(∀b)(∃c)(∀d)(a · c = d · b) as 2 equal formulas using only one type of quantifier

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How to do 2 equal formulas using only one type of quantifier

(∃a)(∀b)(∃c)(∀d)(a · c = d · b)

I have to use only ∀ in the first formula and only ∃ in the second formula.