s 3 1

s 2 1

s 2 2

s 1 1

( 1 + α 2 1 + α 3 1 , 1 + α 1 1 + α 3 1 , 0 )

( 0 , 0 , 0 )

s 1 2

( 0 , 0 , 0 )

( 0 , 0 , 1 + α 1 2 + α 2 2 )

s 3 2

s 2 1

s 2 2

s 1 1

( 0 , 0 , 1 + α 1 1 + α 2 1 )

( 0 , 0 , 0 )

s 1 2

( 0 , 0 , 0 )

( 1 + α 2 2 + α 3 2 , 1 + α 1 2 + α 3 2 , 0 )