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In  this  section  each  statement,  function  and  system  variable 
is 
explained.  How  to 
describe 
is 
explained 
in 
FORMAT. This symbols have the following meanings: 
<  >  : Indicates the general description, such as, variables and data. 
Describes the 
most generic meaning. 
Notes: 
<variable> includes <array element>. 
<variable> includes <numerical variables> and <character variable>. 
<data> 
includes <variable> and <constant>. 
[1 
: Indicates that tlie part enclosed 
by 
[  1 can be omitted. 
[  1 
... 
: Indicates that the part enclosed 
by 
[  1 
... 
can be omitted or more than one 
repetition 
is 
possible. 
{
AB} 
: Choose one, A or B.