Five girls — Fiorenza, Gladys, Helene, Jocelyn, and Kaitlin – and four boys – Abe, Bruce, Clive, and Doug ride to school each day in three separate buses.
Abe and Fiorenza always ride together. Gladys and Helen always ride together.
Jocelyn and Kaitlin never ride together. Doug always rides in the bus with the fewest children.
Boys cannot outnumber girls in any bus. The maximum number of children in any bus is four.
The bus in which Doug rides can hold how many children?
Bruce can ride with each of the following except: