function x = mynt2int(nt)
if nt=='A' x=1; return; end
if nt=='C' x=2; return; end
if nt=='G' x=3; return; end
if nt=='T' x=4; return; end
if nt=='R' x=5; return; end
if nt=='Y' x=6; return; end
if nt=='K' x=7; return; end
if nt=='M' x=8; return; end
if nt=='S' x=9; return; end
if nt=='W' x=10; return; end
if nt=='B' x=11; return; end
if nt=='D' x=12; return; end
if nt=='H' x=13; return; end
if nt=='V' x=14; return; end
if nt=='N' x=15; return; end
x=0;