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1
S AGT
...
5
R AGT
7

...
S AGT
...
...
R AGT
...

...
S AGT #1
...
...
R AGT #2
...

my @Srecs;
while( <FILE> ) {
...
    printf "There were %d unmatched S-records\n"; scalar @Srec;
} 
## Other stuff