extra.help - show extended help
add - add an item to shop for
add.store - add a store
+ at STORE_ID - use this store for future commands
+ buy - mark item as purchased
clear STORE - clear all purchased items for STORE
list - re-show list from last used store
+ past STORE - re-show past purchased items from STORE
stores - list all stores
- at STORE_ID - use this store for future commands
- buy - mark item as purchased
'''
extended_help = '''
assign ITEM_ID - assign item to last used store id