@Override
	public void init(int l, int h) {
		if(!(l%2 == 1 && h%2 == 1))
			throw new PreConditionError("l and h must be odd");
		if(!(l>0 && h>0))
			throw new PreConditionError("l and h must be positive");
		super.init(l,h);
		if(!(super.getNombreColonnes()==l))
			throw new PostConditionError("getNombreColonnes(init(l,h)) != l");
		if(!(super.getNombreLignes()==l))
			throw new PostConditionError("getNombreLignes(init(l,h)) != l");
	}