The word Grubing is misspelled against Grubbing, which is present continuous of "Grub"
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Grubbing has double "bb" is mispronounced as "b"
Remember double 'BB' in between the strings Gru & ing which should not be misspelled with single 'B'
Wrong Spelling: Gru-b-ing
Correct Spelling: Gru-bb-ing
Check more misspelled words of Grubbing to spell it correct.