# cluster file
# id chunks source list
# -ve cluster ids are not subtracted from the data
-1 2 P3C196C1 P3C196C2 P3C196C3 P3C196C4
2 1 P2C1
#3 2 P3C1 P3C2 P3C3
#4 1 P12C1 P12C2