HELP - print this message
DEBUG - set debug mode (default)
EDIT - set edit mode
LOAD - load unspecialised Regulus grammar
LOAD_GENERATION - load unspecialised Regulus generation grammar
EBL_LOAD - load specialised Regulus grammar
EBL_LOAD_GENERATION - load specialised Regulus generation grammar
LEX WordOrWords - add item for WordOrWords, e.g. 'LEX pain' or 'LEX bright light'
GAP - add item for gap expression
PARSE WordOrWords - add item formed by parsing WordOrWords, e.g. 'PARSE where is the pain'
GENERATE ID - add all items formed by generating from ID, e.g. 'GENERATE 1'
COMBINE IDOrIDs - combine items into a new item, e.g. 'COMBINE 1' or 'COMBINE 1 3'
CUT ID Node - cut item ID at Node, e.g. 'CUT 2 3'. In edit mode, only add a cut marking.
UNCUT ID Node - remove cut marking on item ID at Node, e.g. 'UNCUT 2 3' [only meaningful in edit mode]
JOIN ID1 Node ID2 - attach item ID2 under Node of ID1, e.g. 'JOIN 1 15 4'
JOIN ID1 ID2 - attach item ID2 under ID1, e.g. 'JOIN 1 4'
SHOW ID - show item ID, e.g. 'SHOW 1'
SHOW ID Node - show material under Node of item ID, e.g. 'SHOW 1 15'
RULE ID Node - show rule at Node of item ID, e.g. 'RULE 1 15'
DELETE IDOrIDs - delete item ID or IDs, e.g. 'DELETE 1' or 'DELETE 1 2'
DELETE_ALL - delete all items
SUMMARY - print summary for each item
EXIT - leave stepper