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### remove_vertical_border_strip

Hello, I'm interested to know if there is a way to define the analoge of "remove_horizontal_border_strip(k)" for integer partitions, but for vertical border strip. I think that maybe with IntegerListLex.

### remove_vertical_border_strip

Hello, I'm interested to know if there is a way to define the analoge of "remove_horizontal_border_strip(k)" for integer partitions, remove_horizontal_border_strip(k) which returns the partitions obtained from self by removing an horizontal border strip of length k.

For example:

Partition([5,3,1]).remove_horizontal_border_strip(1).list()
[[5, 3], [5, 2, 1], [4, 3, 1]]


but for vertical border strip. I think that maybe with IntegerListLex.strip.