The word Tunneling is misspelled against Tunnelling, which is present continuous of "Tunnel"
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Tunnelling has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings tunne & ing which should not be misspelled with single 'L'
Wrong Spelling: tunne-l-ing
Correct Spelling: tunne-ll-ing
Check more misspelled words of Tunnelling to spell it correct.