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- got signal
- trap -- 'echo got signal' USR1
- sent 1 signal
- got signal
- sleep interrupted
- trap -- 'echo got signal' USR1
- sent 2 signal
- got signal
- sleep interrupted
- trap -- 'echo got signal' USR1
- sent 3 signal
- got signal
- sleep interrupted
- trap -- 'echo got signal' USR1
- sent 4 signal
- got signal
- sleep interrupted
- trap -- 'echo got signal' USR1
- sent 5 signal
- sleep completed
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