A        Expiration date and a carrier's factor may be changed at any time
B        Expiration date may be changed at any time
C        Expiration date and factor may not be changed before the trigger date, but may 
         be changed after the trigger date
D        Expiration date may be changed at any time; carrier may change its factor only 
         prior to the trigger date
E        Expiration date may be changed at any time; carrier may change its factor only 
         after the trigger date
F        Expiration date may not be changed before the trigger date; it may be changed 
         after the trigger date
G        Expiration date may be changed at any time; carrier may change its factor only 
         on number of days advance notice as indicated in the transaction
H        Expiration date may be changed only after the number of days advance notice 
         indicated in the transaction
I        Expiration date may be changed only after 30 days advance notice
L        Date can be changed at any time; the through-rate can be changed at any time by 
         the proposer
M        Rate Proposer Only
N        Expiration Date and Factor may be Changed Only After the Number of Days Advance 
         Notice Indicated in the Transaction