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The given series is J L K Y P S F D E A C I. and the second, fourth, sixth, ninth, tenth, and twelfth letter (from left) of the letter series are (J L K Y P S F D E A C I) i.e. (L,Y,S,E,A,I,) So the word formed with these alphabets is EASILY. And in the options Antonym of Easily is Effortful.