The spelling of "study at sad" seems confusing, but it is actually a phonetic representation using IPA symbols. "Study" is pronounced as /ˈstʌdi/ with stress on the first syllable and the "uh" sound in the second syllable. "At" is pronounced as /æt/ with the "a" sound as in "cat." Finally, "sad" is pronounced as /sæd/ with the same "a" sound as in "at." While this spelling may not be common, it is a useful tool to accurately represent spoken language.