ST-1

ST-2

ST-3

ST-9

ST-1

ST-2

ST-3

ST-9

fig. 2.7

44 - 45

Capitolo 2

fig. 2.8

S

T

-

6

S

T

-

6

S

T

-

5

S

T

-

5

S

T

-

4

S

T

-

4