Correct Results should be like this:
 
 No. of single letters:
 A=48; T=48; G=48; C=48; Error=2.
 Length: 194.

 No. of 3-letter words:

 TCA=1; TCC=1; TCG=1; TCT=1; TTC=1;

 TTT=1; TTA=1; TTG=1; TAC=1; TAT=1;

 TAA=1; TAG=1; TGC=1; TGT=1; TGA=1;

 TGG=1; CTA=1; CTC=1; CTG=1; CTT=1;

 CCA=1; CAT=1; CAA=1; CAG=1; CGA=1;

 CGC=1; CGG=1; CGT=1; ATA=1; ATC=1;

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

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

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

 CCG=1; CCT=1; CAC=1; GTA=1; GTC=1;

 GTG=1; GTT=1; GCA=1; GCC=1; GCG=1;

 GCT=1; GAC=1; GAT=1; GAA=1; GAG=1;

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