This file is a Nucleic-acid similarity file for use with BOXSHADE.
Is resembles the GCG  simplify.txt, but similarities contained
in this file are not automatically set-forming. This means:
The line 
I LVM     means that I is similar to L,V and M and also that
                     L,V,M are similar to I.
          It does not imply that L is similar to V or to M.
For achieving this, more lines (the next ones) are necessary.
Although is seems weird, this feature has been chosen DELIBERATELY
because I think it could be helpful in some cases.
Other format requirements are the same as for SIMPLIFY.TXT in the 
GCG-package.
..
A GR
G AR
R AG
C TY
T CY
Y CT