T

| T |

T

| T |

A 5

2 2 3 5

A 6

2 3 3 2 5

PSL ( 2 , 7 )

2 3 3 7

PSL ( 2 , 8 )

PSU ( 3 , 3 )

2 5 3 3 7

PSL ( 3 , 3 )

2 4 3 3 13

PSL ( 2 , 17 )

2 4 3 2 17