string1 1 C A 
string1 3 T C 
string1 20 A T  /* This is out of range, and has to be omitted*/
string2 2 A C 
string2 5 A T 
string2 9 G A 
string2 30 A C /* This is out of range, and has to be omitted*/
string3 9 G A /* This string is not there in the main file.. so has to be omitted */