Contravalation or Contravallation: How To spell?

The word Contravalation is misspelled against Contravallation, a noun meaning "A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged."

--> Contravallation has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings contrava & ation which should not be misspelled with single 'L'
Wrong Spelling:  contrava-l-ation 
Correct Spelling:  contrava-ll-ation 
Find more incorrect spellings of Contravallation to spell right way.

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