Get line1 and line4 in a repeat pattern file
I have a datafile contain hundreds of lines:
line1
1
2
line4
==================
line1
4
2
line4
==================
line1
3
1
line4
===================
.......
I want data to be:
line1
line4
=================
line1
line4
=================
line1
line4
How can I do this? Please help!
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