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5ccm2 = ccm2/$text=dict:p+lzp+ppmd:10:512mb/$wav=tta/$bmp=bmp/$jpg=jpg/$jpgsolid=precomp+rep:32/$iso=ecm+precomp+ccm2/$precomp=precomp+ccm2

this line means:
- compress group $text with dict:p+lzp+ppmd:10:512mb
- compress group $wav with tta
- ....
- compress remaining files with ccm2

groups are defined in arc.groups file. i.e.

$exe
*.exe
*.dll
$text
*.txt
$binary
*.x
*.y
$default
*.z

means that exe/dll files will be placed in group $exe, txt files into $text, x/y/z and all unspecified files (denoted by $default) - in group $binary

arc.groups also establishes file sorting order for compression