The word Chalenging is misspelled against Challenging, which is present continuous of "Challenge"
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Challenging has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings cha & enging which should not be misspelled with single 'L'
Wrong Spelling: cha-l-enging
Correct Spelling: cha-ll-enging
Find more wrongly spelled words of Challenging to spell it well.