Issues with both methods:

John's doesn't work for this data:
aaaaaa
aaaaaa
bbb
cccccc
cccccc

I would expect:
aaaaaa
bbb
cccccc

I would get:
aaaaaa
bbb
cccccc
cccccc

With the solution by Chas and the data:
aaaaaa
aaaaaa
bbb
aaaaaa
aaaaaa

I expect:
aaaaaa
bbb
aaaaaa

I get:
aaaaaa
bbb

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