Help: syntax error in shell script

[cdohert at ccvax.ucd.ie]

Hi Unix Wizards,
I am attempting to write my first shell script and I'm perplexed
by the error message I'm getting from the shell parser.
The script is as follows
******************************************************************
for network in 1 2 3 5 10 20 30
do
     `expulse` $network 0
     if test -f pulse.${network}.net
     then `cascor1.3` <<!
         pulse.${network}.net
         1000
         1000
         y
         y
         pulse.${network}.wts
         !
     > pulse.${network}.output
     fi
done

******************************************************************
#`expulse` & `cascor1.3` are programs that take various arguments.

prompt>sh script
 results in the error:
line 22 `end of file' unexpected.

My question is why?
Probably elementary error but any pointers welcome.

Conor Doherty
Dept of Computer Science
University College Dublin