1. Faculty of Mathematics and Computer Science , University of Lodz , Banacha 22 , 90-238 Lodz , Poland
2. Department of Molecular Genetics , University of Lodz , Pomorska 141/143 , 90-236 Lodz , Poland
3. Department of Philosophy , University of Opole , Katowicka 89 , 45-061 Opole , Poland