The word Tunelling is misspelled against Tunnelling, which is present continuous of "Tunnel"
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Tunnelling has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings tu & elling which should not be misspelled with single 'N'
Wrong Spelling: tu-n-elling
Correct Spelling: tu-nn-elling
Check more misspelled words of Tunnelling to spell it correct.