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  1. or download this
    #!/usr/bin/perl -w
# Counting 3-letter words in a string
$a="NTCA TCC TCGTCTTTCTTTTTATTGTACTATTAATAGTGCTGTTGATGGCTACTCCTGCTTCCA
+CAT
...
 GCT=$GCT; GAC=$GAC; GAT=$GAT; GAA=$GAA; GAG=$GAG;\n
 GGA=$GGA; GGC=$GGC; GGG=$GGG; GGT=$GGT.\n"; 
exit;
  2. or download this
    Results obtained (wrong):

 Microsoft Windows [Version 6.1.7600]
...
 GCT=4; GAC=4; GAT=2; GAA=2; GAG=3;

 GGA=1; GGC=5; GGG=2; GGT=2.
  3. or download this
    Correct Results should be like this:
 
 No. of single letters:
...
 GCT=1; GAC=1; GAT=1; GAA=1; GAG=1;

 GGA=1; GGC=1; GGG=1; GGT=1.