#cat log5
mmmm
1234
nnnn
2344
#sed -n '{N;s/\n/\t/p}' log5
mmmm 1234
nnnn 2344
#cat log5
mmmm
1234
nnnn
2344
#sed -n '{N;s/\n/\t/p}' log5
mmmm 1234
nnnn 2344
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