sentence: The hugest gap is in 1981 , when the cheapest price was combined with the highest expenditure on cigarette packs in the whole interval .
modified: The hugest gab is in 1981 where is the cheapest price combined to the highest expanditure of cigarette packs in the whole interval .
transformation: NOUN, PUNCT, ADV, VERB, VERB:TENSE, PREP, SPELL, PREP