(v,k,λ)

G

c

d

基区B

设计

(15,8,4)

$S_5$

3

5

{1, 3, 5, 7, 8, 10, 12, 14}

$\cong D_1$

(15,8,4)

$3S_5$

3

5

{1, 3, 5, 7, 8, 10, 12, 14}

$\cong D_1$