My mac air is using 55 GB of "other"  What is that?  How do I reduce it?

My MacBook Air is using 55 GB of "other".  What is that and how can I reduce it?

See here for answer about the OTHER which is taking up space:
http://pondini.org/TM/30.html
and here:
http://pondini.org/OSX/DiskSpace.html
See Kappys excellent note on the rest of “other” files taking up your space:
What is "Other" and What Can I Do About It?

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