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b

P B1(Y = 1)

P B2(Y = 2)

C1

P B3(Y = 3)

C3

C2 A2(Y = 2)

A1(Y = 1)

P Bn(Y = n)

An(Y = n)

A3(Y = 3)

C4 Y

c

P

D1(Y = 1) a

P

D2(Y = 2) a

P

D3(Y = 3) a

Dn(Y = n) P

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