▁were ▁introduced ▁at ▁third ▁level . ▁The ▁groups ▁were ▁called ▁that ▁way ▁because ▁unlike ▁the ▁fourth ▁tier ▁groups ▁they ▁did ▁not ▁correspond ▁territorial ly ▁to ▁Y ug oslav ia ' s ▁six ▁federal ▁republic s . ▁ ▁The ▁system ▁The ▁following ▁table ▁shows ▁the ▁structure ▁as ▁it ▁was ▁employed ▁in ▁the ▁ 1 9 9 0 – 9 1 ▁season , ▁the ▁last ▁season ▁before ▁Sloven ian ▁and ▁Cro at ian ▁clubs ▁depart ed ▁after ▁their ▁countries ▁declared ▁independence . ▁ ▁Bos n ian ▁and ▁Mac ed onian ▁clubs ▁also ▁abandoned ▁the ▁system ▁during ▁and ▁after ▁the ▁following ▁ 1 9 9 1 – 9 2 ▁season . ▁ ▁Ser bia ▁and ▁Mont en eg ro ▁stayed ▁un ified ▁as ▁FR ▁Y ug oslav ia ▁and ▁continued ▁compet ing ▁together ▁all ▁the ▁way ▁until ▁ 2 0 0 6 . ▁ ▁The ▁league ▁system ▁structure ▁was ▁kept ▁similar , ▁with ▁the ▁ 4 ▁Inter - Rep ublic ▁le agues ▁being ▁replaced ▁by ▁ 4 ▁le agues ▁distributed ▁ge ograph ically : ▁Mont en egr in ▁League , ▁Ser bian ▁League ▁East , ▁Ser bian ▁League ▁North ▁and ▁Ser bian ▁League ▁West . ▁ ▁See ▁also ▁Bos n ian ▁football ▁league ▁system ▁Cro at ian ▁football ▁league ▁system ▁Ser bian ▁football ▁league ▁system ▁Kos ovo ▁football ▁league ▁system ▁▁▁▁▁▁▁▁ ▁Category : Foot ball ▁league ▁systems ▁in ▁Europe <0x0A> </s> ▁B ovy ▁Sor ▁U dom son ▁( born ▁January ▁ 2 1 , ▁ 1 9 8 4 ) ▁is ▁a ▁Th ai ▁Mu ay