Spawning objects on a number of fixed places at random

So, yeah in know its now problem to spawn objects in random locations on the layout.

But i wanna know, is there a simple solution to spawn objects from a random number of differend fixed points?

If i use the "choose" command, i can only choose between a specific x or x or x AND y or y or y position.

But i need a choose between xy or xy or xy.

I hope its clear what i mean.

(I have some free days and i spend them with friend, drinking, making graphics, drinking, playing around in construct and drinking.......did i mentioned drinking? ^^ Soooo, if there are some spelling mistakes, its the alcohol ^^)

Bring some fixed positioned 'spawners' in the layout, all instances of the same Sprite.

Give those a boolean 'Occupied'.

+ System: Trigger once

+ (no conditions)

-----> Sprite: Destroy

----+ System: Repeat floor(random(0,11)) times <-- this is a random between 0 and 10, fill in what suits you

--------+ Spawner: [X] Is Occupied

--------+ System: Pick a random Spawner instance

---------> Spawner: Set Occupied to True

---------> Spawner: Spawn Sprite on layer 0 (image point 0)

+ (no conditions)

-----> Spawner: Destroy

I´m a bit confused.

Thats what i have right now:

--------+ Spawner: [X] Is Occupied <--- the [X] means inverted (official scirra pseudo code).

I am such an idiot. Thx man. ^^