[Solved] very noob question about MP sync

[catarix7]

hi all.
i read that math.random should generate the same number for all players. my code

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for i, player in ipairs(game.players) do
					local Number = math.random(1, 20)
					local Number2 = math.random(1, 20)
						player.print({"",{Number},{Number2}});
					if (game.get_surface(1).can_place_entity{name = "medium-biter", position = {Number, Number2}}) then
					game.get_surface(1).create_entity{name = "medium-biter", position= {Number, Number2}, force = game.forces.player}
					else game.player.print({"",{Number},{Number2},"Can't create here"});
					end
			end	

created 2 separate biter for 2 players. how i can sync this code?
second ever more noob question - why player.print command on screen looks like "unknown key {Number} unknown key {Number2} ?

[DaveMcW]

If you only want to create one biter, you should move it outside the loop.

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local Number = math.random(1, 20)
local Number2 = math.random(1, 20)
if (game.get_surface(1).can_place_entity{name = "medium-biter", position = {Number, Number2}}) then
    game.get_surface(1).create_entity{name = "medium-biter", position= {Number, Number2}, force = game.forces.player}
    for i, player in ipairs(game.players) do
        player.print({"",{Number},{Number2}});
    end
else
    for i, player in ipairs(game.players) do
        player.print({"",{Number},{Number2},"Can't create here"});
    end
end

The string joiner in lua is ..

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player.print(Number .. "," .. Number2 .. " Can't create here")

[catarix7]

it works. Thank you very much