The word Decasylable is misspelled against Decasyllable, meaning "A line of ten syllables."
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Decasyllable has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings decasy & able which should not be misspelled with single 'L'
Wrong Spelling: decasy-l-able
Correct Spelling: decasy-ll-able
Explore spell check of Decasyllable to spell without errors.