Pick the two sentences in order that fit best between sentences S1 and S4:
S1. Rag picking is not a new profession in India.
P. They are not, however, offered any constructive support by the local government.
Q. Every Indian city has had its own band of pickers for many years.
R. They keep the city clean, unofficially joining forces with the municipal staff.
S4. They often work in dirty and hazardous conditions, but get no kudos for their
services.