difference between \column and \left-column?

[Thomas Morley]

Hi,

I'm working on some markup-commands.

Currently we have the two markup-commands \column and \left-column.
Whats the difference in usage between them?
If there isn't any, why not get rid of one of them.

\markup {
  \column {
    one
    two
    three
  }
}

\markup {
  \left-column {
    one
    two
    three
  }
}

Cheers,
  Harm