Results obtained (wrong):

 Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\ >cd desktop

C:\Users\ \Desktop>wolf.pl

 No. of single letters:

 A=48; T=48; G=48; C=48; Error=2.

 Length: 194.

 No. of 3-letter words:

 TCA=4; TCC=3; TCG=2; TCT=2; TTC=2;

 TTT=2; TTA=3; TTG=3; TAC=2; TAT=4;

 TAA=4; TAG=3; TGC=3; TGT=2; TGA=4;

 TGG=2; CTA=3; CTC=3; CTG=3; CTT=3;

 CCA=2; CAT=3; CAA=3; CAG=3; CGA=3;

 CGC=3; CGG=3; CGT=4; ATA=3; ATC=3;

 ATT=3; ATG=3; ACA=4; ACC=1; ACG=4;

 ACT=3; AAC=3; AAT=3; AAA=1; AAG=3;

 AGC=3; AGT=3; AGA=3; AGG=3; CCC=1;

 CCG=3; CCT=3; CAC=3; GTA=4; GTC=2;

 GTG=2; GTT=2; GCA=2; GCC=4; GCG=4;

 GCT=4; GAC=4; GAT=2; GAA=2; GAG=3;

 GGA=1; GGC=5; GGG=2; GGT=2.