Aroba or Arroba: How To spell?

The word Aroba is misspelled against Arroba, a noun meaning "A Spanish liquid measure for wine = 3.54 imp. gallons, and for oil = 2.78 imp. gallons."

Arroba has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings a & oba which should not be misspelled with single 'R'
Wrong Spelling:  a-r-oba 
Correct Spelling:  a-rr-oba 
Find more incorrect spellings of Arroba to spell right way.

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