S : NS_B CMD_G NS_E
CMD_G: NAME COMMAND_G

# S : NS_B CMD_T NS_E
# CMD_T: NAME COMMAND_T DIGIT_LOOP
# DIGIT_LOOP: DIGIT_LOOP DIGIT
# DIGIT_LOOP: DIGIT

S : NS_B ACKL NS_E
ACKL: ACK

S : NS_B ACTION NS_E
ACTION: INTERACT