Complete the following statements with one of the terms listed below. You may use a term more than once, and some terms may not be used at all.

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a$.$ An s$-$shaped line would represent a

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$\backslash$table$[[$Account analysis,Average cost per unit,Committed fixed costs,Curvilinear cost$($s$)],[$Fixed cost$($s$),$High$-$low method,Mixed cost$($s$),$R$-$squared$],[$Regression analysis,Step cost$($s$),$Total cost$($s$),$Variable cost$($s$)]]$