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отсутствие покрытия stresses
mob.com.	lack of service (Authorities were able to pull a text message from Gerrish's phone at 11:56 a.m. asking for help. It was never received due to lack of cell service in the area. ... About 13 minutes following the unsuccessful text, Gerrish's phone showed that he tried calling multiple numbers, not including 911, but again, due to lack of service, the calls never connected, authorities said. cnn.com 4uzhoj)

отсутствие покрытия: 4 phrases in 4 subjects

Automobiles	1
Aviation	1
Electrochemistry	1
Insurance	1