Rdfind not allowed to delete files in first (master) directory

[rleaver152]

Many times I want to run rdfind on a MASTER "A" directory comparing against eg B directory to remove duplicates in B However rdfind also removes any internal duplication in "A" but I need to keep it intact as my master reference directory. Is there a way other than making A read only, to tell rdfind to only remove duplicates in B only (any directory other than A). eg rdfind A B only removes duplicates in B that are in A and/or B but leaves A untouched?