Sixteen topological types in βω−ω

In this paper we describe sixteen topological types in βω?ω. Among others, we show that there is a weak P-point x ∈ βω?ω which is a limit point of some ccc subset of βω?ω?{x} and that there is a point y ∈ βω?ω which is a limit point of some countable subset of βω?ω?{y} but not of any countable discrete subset of βω?ω?{y}.