11.   Caused by drought, erratic rainfall and warfare, it spreads across seven countries.

a. + rainfall >>共 180
heavy 30.98%
normal 4.45%
average 3.25%
record 3.06%
low 2.97%
heaviest 2.32%
additional 2.23%
high 2.04%
significant 2.04%
torrential 1.95%
erratic 1.02%
erratic + n. >>共 249
behavior 13.75%
performance 3.76%
pattern 3.44%
play 2.45%
wind 2.29%
start 1.80%
season 1.80%
rainfall 1.80%
movement 1.64%
weather 1.47%
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