Send a message to Smith at CMU. (P1.1)
 Type out the last message. (P1.2)
 List the messages from Smith. (P1.3)
 Print all the messages from Smith on the Dover. (P1.4)
 Delete the last two messages. (P1.5)
 Forward message two to Jones. (P1.6)
 Send Jones a message ccing Smith. (P1.7)
 Reply to message three copying Smith. (P1.8)
 To Smith a CMU forward message five. (P1.9)
 Answer the last message from Jones. (P1.10)
 I want to send a message to Smith. (P1.11)
 Print out on the Dover the messages received from Smith. (P1.12)
 Please reply to message four. (P1.13)
 Did I receive any mail from Smith? (P1.14)
 Did Smith at CMU send me any mail? (P1.15)
 How do I send a message? (P1.16)
 How do I delete this message? (P1.17)
 How many messages do I have? (P1.18)
 Are there any new messages from CMU? (P1.19)