log-odds matrix: alength= 4 w= 7 E= 8.7e-045
   125  -1404   -291    -60
  -101  -1404    224  -1404
 -1404   -133    238  -1404
   134  -1404  -1404    -81
    74   -333    132  -1404
    66    -27   -110    -31
    83      0    -74   -118