elusive – adj. hard to understand, define or remember

formula – n. a plan or method for doing, making, or achieving something

perfume – n. a liquid substance that you put on your body in small amounts in order to smell pleasant

formal – adj. suitable for serious or official speech and writing

superlative – adj. of or relating to the form of an adjective or adverb that is used to indicate the greatest degree of a quality
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