// Check all the LUTs in this slice
Instance i = router.design.getInstanceAtPrimitiveSite(site);
String[] letters = {"A","B","C","D"};
for(String letter : letters){
if(i.testAttributeValue(letter+"5LUT", "#OFF") &&
i.testAttributeValue(letter+"6LUT", "#OFF") &&
!i.hasAttribute("_GND_SOURCE") &&
!i.hasAttribute("_VCC_SOURCE")){
i.addAttribute(new Attribute(new Attribute(srcTypeString,"",letter)));
currStaticSourcePin = new Pin(true, letter, i);
i.addPin(currStaticSourcePin);