text: Case 3.1 : Exactly 3 numbers in range of form ( 2 k , 2 k + 1 , 2 k + 2 )
code: if ( ( L % 2 ) == 0 ) : NEW_LINE INDENT flag = True ; NEW_LINE possibleA = L ; NEW_LINE possibleB = L + 1 ; NEW_LINE possibleC = L + 2 ; NEW_LINE DEDENT else : NEW_LINE