Perhaps you should try some spelling variations:
introduction abstraction » introduction absorption, introduction abstract, introduction abstracts
abstraction method » distraction methods, extraction method, subtraction method
method recursive » methods recursive, method discursive, other recursive
recursive array » recursive warrant, recursion arrays, receive array
array formats » array format, assay formats, array formulas

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• Adding a wildcard symbol may retrieve word variants: introduction abstraction method recursive array formats*.