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Table 2
The list of 34 possible input feature sets.
#	Representation	PAM	CB	BFA	BFB

1	SO	-	-	-	-
2	SO	+	-	-	-

3	TO	-	-	-	-
4	TO	+	-	-	-
5	TO	-	+	-	-
6	TO	-	-	+	-
7	TO	-	-	-	+
8	TO	+	+	-	-
9	TO	+	-	+	-
10	TO	+	-	-	+
11	TO	-	+	+	-
12	TO	-	+	-	+
13	TO	-	-	+	+
14	TO	+	+	+	-
15	TO	+	+	-	+
16	TO	+	-	+	+
17	TO	-	+	+	+
18	TO	+	+	+	+

19	ST	-	-	-	-
20	ST	+	-	-	-
21	ST	-	+	-	-
22	ST	-	-	+	-
23	ST	-	-	-	+
24	ST	+	+	-	-
25	ST	+	-	+	-
26	ST	+	-	-	+
27	ST	-	+	+	-
28	ST	-	+	-	+
29	ST	-	-	+	+
30	ST	+	+	+	-
31	ST	+	+	-	+
32	ST	+	-	+	+
33	ST	-	+	+	+
34	ST	+	+	+	+

The new features to each of the three representations (SO, TO or ST) are added one at a time and as combinations of two and more. The original features are already given in Table 1 and are not shown here.
Özen et al. BMC Structural Biology 2009 9:66 doi:10.1186/1472-6807-9-66

Table 2