Arrange the steps for preparing bacterial cells for staining in the correct order:$1.$ Heat$-$fix the bacteria$\mathrm{.}2.$ Air$-$dry the bacteria$\mathrm{.}3.$ Create a bacterial smear$\mathrm{.}3,1,22\mathrm{.}1\mathrm{.}31\mathrm{.}2\mathrm{.}33,2,1$