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If the border of each column in a histogram has a clearly marked outline then it has an outliner.
The Andis T-Outliner is great for all around trim work around ears, neck, beard and mustache.
The Andis T-Outliner trimmer is good both for maintaining beards and for trimming them off, but it will quickly dull the razor.
A programm to edit and manage mainly textual information in a tree structured way.
Outliners are when a set of numbers has a number too high or to low. Such as
15 16 17 26
26 is an outliner