in your else if add a second condition:
ElseIf ((WA_eCart_DisplayInfo(stickersBE, "Size") > 40 AND WA_eCart_DisplayInfo(stickersBE, "Size") < 90)......
and add a 3rd elseif for > 90:
ElseIf ((WA_eCart_DisplayInfo(stickersBE, "Size") > 90 ) ......
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