Double legs distribution by types of season
Season 4n 8 (x2), 28
Season 4n+1 9, 25
Season 4n+2 6, 10, 14, 18 (x2), 22, 26
Season 4n+3 7, 19, 23, 27 (x2)
Since the introduction of double legs in leg 6 for avoiding a Hungary's begging law, for every singly even numbered season, they always have double leg(s) in their respective seasons
Singly even number is number which is divisible by two but not by four