Computing inclusion probabilities from an explicit sampling design

Suppose there are five units, $u_1,\dots,u_5$ in a population. The probabilities of selecting a sample of size two with different units are: $p(\{u_1,u_2\})=1/2, p(\{u_3,u_4\})=1/6, p(\{u_3,u_5\})=1/6,\ p(\{u_4,u_5\})=1/6$. If $\pi_i$ denote the probability of including $i$th unit in the sample, then $(\pi_1,\dots,\pi_5)=$