In the following paragraphs, we will discuss the format lines used in the R/T message format. Refer to table 2-4. FORMAT LINES 1, 2, 3, AND 4 Format line 1 is not used in R/T procedures. Format lines  2  and  3  contain  the  call  sign,  the  proword MESSAGE, and the transmission identification. The call may take one of the following forms: Full Call “Kamehameha (station called), THIS IS Vallejo” (station calling) Abbreviated Call “THIS IS Vallejo” (station calling). Normally, a full call is used when first establishing a net and when reporting into a previously established net.  A  full  call  is  also  used  in  the  transmission instructions and address components when a message is required to be  relayed to a station on a different net. Once  communications  are  established  and  no confusion will result,  an abbreviated call may be used. To   further   expedite   voice   communications,   the receiving station may omit the proword THIS IS when the station is responding to a call and communications are good. Additionally, the call may be omitted entirely when two stations are in continuous communication or the net is not shared by a third  station. When a collective call sign is used and some of the addressees are to be exempted, you do so in the call by using the proword EXEMPT, followed by the call sign(s) of the station(s) exempted. For example: “Edison (collective call) EXEMPT Tecumseh (station exempted), THIS IS Vallejo” (station calling). Notice that only one station is exempted in this call- up. If there had been more than one station, each station would have been spoken before the proword THIS IS. After the call, transmit the proword MESSAGE if you wish to indicate that a message you are about to transmit requires recording. For example: “Vallejo (station called), THIS IS Kamehameha (station calling) MESSAGE” (message is to follow). The  transmission  identification  is  normally  a station  serial  number  used  mostly  in  teleprinter procedures.  When used in voice communications, the transmission identification is the last element of format lines 2 and 3, consisting of the station serial number preceded by the proword NUMBER. Format   line   4   contains   the   transmission instructions,  which  may  consist  of  the  prowords RELAY TO, WORDS TWICE, DO NOT ANSWER, or READ BACK. The use of these prowords is explained later. FORMAT LINE 5 Format line 5 contains the precedence, DTG, and any necessary message instructions. The precedence is the first element of format line 5.  In the case of a dual- precedence   message,   the   higher   precedence   is transmitted   first;   for   example,   “PRIORITY ROUTINE.” The DTG is preceded by the proword TIME.   An example of this format line is as follows: “Vallejo,   THIS   IS   Polk,   RELAY   TO   Key, PRIORITY, TIME, Tree Zero Wun Fower Fower Fife Zulu.” Message instructions are not normally required in R/T messages. When included, they consist of short and concise instructions that indicate the status of the message.  Message  instructions  remain  with  the message until the message reaches its destined station. For example, if the message is a suspected duplicate, the phrase “This Message Is A Suspected Duplicate” immediately follows the DTG. FORMAT LINES 6, 7, 8, AND 9 Format lines 6, 7,  8, and 9 form the address of the message and are recognized by the prowords FROM, TO, INFO, and EXEMPT, respectively. When the originator   and   the   addressee   are   in   direct communication, the call may serve as the address. Table 2-5 is an example of an R/T transmission showing elements of the heading components (format lines 2 through 9). 2-12