local previous_key = previous_key or nil
local walls_array = {
[1] = {positions = {Position(5989, 6041, 7), Position(5989, 6041, 7)}, itemid = 1271},
[2] = {positions = {Position(5989, 6041, 7)}, itemid = 1271},
[3] = {positions = {Position(5989, 6041, 7)}, itemid = 1271},
}...