Please help

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function second_hook()
parse("spawnnpc 1 "..math.random(zombix1,zombix2).." "..math.random(zombiy1,zombiy2).."")
end
function second_hook()
parse("spawnnpc 1 "..math.random(zombix1,zombix2).." "..math.random(zombiy1,zombiy2).."")
end
function second_hook()
for x=0, map("xsize") do
for y=0, map("ysize") do
if tile(x,y,"frame")==1 then
parse("spawnnpc 1 "..math.random(zombix1,zombix2).." "..math.random(zombiy1,zombiy2).."")
end
end
end
end