Вот вам классический пример раздела вершков и корешковИсточник:
https://xn--80aaaf9agbtgd4a3f4b.xn--p1ai/%d0%bf%d1%80%d0%b8%d0%b1%d1%8b%d0%bb%d1%8c-%d0%b0%d0%b1%d1%80%d0%b0%d0%bc%d0%be%d0%b2%d0%b8%d1%87%d1%83-%d0%b0-%d0%ba%d0%b0%d1%87%d0%ba%d0%b0%d0%bd%d0%b0%d1%80%d1%86%d0%b0%d0%bc-%d0%be/
https://xn--80aaaf9agbtgd4a3f4b.xn--p1ai/%d0%bf%d1%80%d0%b8%d0%b1%d1%8b%d0%bb%d1%8c-%d0%b0%d0%b1%d1%80%d0%b0%d0%bc%d0%be%d0%b2%d0%b8%d1%87%d1%83-%d0%b0-%d0%ba%d0%b0%d1%87%d0%ba%d0%b0%d0%bd%d0%b0%d1%80%d1%86%d0%b0%d0%bc-%d0%be/