Use distance method to detect 8 residues

Tried on 1bww and 1kcl
pretty strait forward, just check contact of those four strands(including side chain),
mark contacts residues between non-H-bond strands,
pick two residues on each strand which 1) there's a residue between them. 2)from these two residues, you can contact with 3 other strands.
then, you'll have 8 residues.

by this way, we know 8 residues in hbalign_9_19.xls are wrong,
two residues of 1kcl on K strand are not Y and V, should be W and Y.

example process as flow

1bww A
3 4 8 9
3	8
23@	71
25#!	72
	73*%
	74*
	75*$
	77$
88$@	35%!
90#	37*@!
9	4
ANS:	23,25,35,37,75,77,88,90:A
1kcl A 582 686
34 35 36 37
34	36
591$!	634@
593#@%	635@
596%	636@%
598%	638!
	640!
650$!	604%
652$#%!	606!
653%
654%
37	35
ANS:	591,593,604,606,636,638,650,652:A