With the latest site update, OR modifiers are now supported with blacklists. This allows for multiple lines to be collapsed down into one, which saves on processing time and makes the blacklist process more quickly on page load.
Simple groupings
Before:
nude
topless
bottomless
After:
~nude ~topless ~bottomless
Complex groupings
Before:
male_focus nude -1girl -multiple_girls
male_focus topless -1girl -multiple_girls
male_focus bottomless -1girl -multiple_girls
After:
male_focus ~nude ~topless ~botomless -1girl -multiple_girls
Non-available groupings
If there is more than one requirement term though (tags without "-" or "~"), then those lines cannot be combined with other lines.
Before:
nude -rating:s
nude breasts -rating:s
ass -rating:s
ass cameltoe -rating:safe
After:
~nude ~breasts ~ass -rating:s
ass cameltoe -rating:safe