The word Bolen is misspelled against Bollen, an adjective meaning "Swollen; puffed out."
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Bollen has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings bo & en which should not be misspelled with single 'L'
Wrong Spelling:  bo-l-en 
Correct Spelling:  bo-ll-en 
Find more incorrect spellings of Bollen to spell right way.