AME Configuration Variables - Repeated Approvers

Hi,

I am working on setting up AME configuration variables for approval in Manager Self Service and I was wondering if someone would assist me with a breakdown/explanation of what each of the options is for 'Repeated Approvers'.  Below is a list of the options, I just want to know what each one actually does:

Once per transaction

One per group or chain

Each occurence

Once per action type

Once per item

Once per transaction

Once per item class

Once per sublist

Thank you in advance!