  The energetically lowest five states of a helium atom are: He($1^1S$),
He($2^3S$), He($2^1S$), He($2^3P$), and He($2^1P$). Long-range interaction
coefficients $C_3$, $C_6$, $C_8$, $C_9$, and $C_{10}$ for all $S-S$ and $S-P$
pairs of these states are calculated precisely using correlated wave functions
in Hylleraas coordinates. Finite nuclear isotope mass effects are included.
