Ob xyoo dhau los, peb tau tsim ntau tshaj 2 lab square meters ntawm ntse thiab ua lag luam tsev cog khoom rau cov neeg siv khoom hauv Tebchaws Europe, Amelikas, Central Asia thiab lwm thaj chaw, pab lawv ua tiav lub hom phiaj ntawm kev tsim khoom thiab txo cov nqi tsim khoom.