The word Bacili is misspelled against Bacilli, which is plural of "Bacillus"
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Bacilli has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings baci & i which should not be misspelled with single 'L'
Wrong Spelling: baci-l-i
Correct Spelling: baci-ll-i
Find more wrongly spelled words of Bacilli to spell it well.