The word Stepened is misspelled against Steepened, which is past tense of "Steepen"
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Steepened has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings St & pened which should not be misspelled with single 'E'
Wrong Spelling:  St-e-pened 
Correct Spelling:  St-ee-pened 
Explore spell check of Steepened to spell without errors.