Table 3 Average search time of each program on 108 queries in the SCOP 1.59. Results for all the methods except ours are taken from [33]. Their experiments were performed on a computer with an Intel Pentium 2.8 GHz processor and 1,024 megabytes of RAM memory. Ours were done on a computer with Intel Pentium 2.66 GHz processor and 1,024 megabytes of RAM memory.