It took me a while too, I had to identify them for my Trust Flag viewer. Normally I would refer you to my site for the exact type of each flag, but it's still uploading data (currently 75% to go).

I took these notes on 3 flags which can be withdrawn:
            type 1. Newbie warning: 'alleges: Due largely to the factors mentioned'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=29
            WITHDRAWN: 'alleged the following, but later withdrew it: Due largely to the factors mentioned in'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=37

            type 2. Violated implied agreement: 'violated a casual or implied agreement, resulting in damages, in the specific act referenced'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=30
            WITHDRAWN: 'alleged the following, but later withdrew it:'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=9

            type 3. Violated written contract with damages: 'violated a written contract, resulting in damages, in the specific act referenced'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=41
            WITHDRAWN: 'alleged the following, but later withdrew it:'
            Sample: https://bitcointalk.org/index.php?action=trust;flag=35

I'll add this overview to the OP.