The sample space has 3^13=1,594,323 elements ranging from:
{A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13} to:
{C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13}
For example, with just two baskets we have 3^2 elements:
{A1 A2}, {A1 B2}, {A1 C2}, {B1 A2}, {B1 B2}, {B1 C2}, {C1 A2}, {C1 B2}, {C1 C2}