11.   Targets included clandestine airstrips and rebel training camps.

12.   The military was reportedly bombing rebel installations, from camps to warehouses to clandestine airstrips.

13.   U.S. and Colombian officials say FARC earns as much as a half-billion dollars a year from protecting drug crops, cocaine laboratories and clandestine airstrips.

a. + airstrip >>共 71
small 9.57%
military 8.51%
clandestine 6.91%
disused 4.79%
remote 4.26%
nearby 4.26%
abandoned 3.72%
private 3.19%
old 2.66%
primitive 2.13%
clandestine + n. >>共 300
radio 6.59%
meeting 4.76%
group 4.76%
operation 4.00%
immigrant 3.03%
program 2.16%
organization 1.95%
weapon 1.84%
immigration 1.84%
service 1.62%
airstrip 1.41%
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