
                                %Variable%

        Variables are alphanumeric strings.  Optional subscripts surrounded
   by square brackets, "[...]", may specified.  Note that variable names 
   are case sensitive.

   %Examples%

   speed, SPEED[j,k,l], x, y

   %Usage%

   Q : displace(t) = %Ÿ%{0,t} speed %d%(t)

