'Bash for file parsing every nth occurance with a structured file having fix pattern

I have a big file with start pattern END at every instance (a snapshots), How do I write new file that can write at every nth instance. e.g. every 2nd snap [1,3,5,..] or every 25th snap [1, 25, 50, 75, 100, ..] with file having snapshots [1,2,3,4,5...1000] with following example pattern.

example:

END
qweqweq
qweqweq
qweqwe
END
typowoeri
ertpoietp
operitope
END
retorter
erteteert
ewrtert

I want

END
qweqweq
qweqweq
qweqwe
END
retorter
erteteert
ewrtert

awk '/END/{i++}{print > "file."i}' file

I used above code to split the file into individual files. I have 3 snaps, and I am able get 3 individual files. But I want a single file with every 2nd snap in it?

bashawksedgrep


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