Mawonekedwe a zida za pu, kusiyana pakati pa zida za pu, chikopa cha pu ndi chikopa chachilengedwe, nsalu ya PU ndi nsalu yachikopa yofananira, yopangidwa kuchokera kuzinthu zopanga, yokhala ndi zikopa zenizeni, zamphamvu kwambiri komanso zolimba, komanso zotsika mtengo. Anthu nthawi zambiri...
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