Step 1
Objects: Silver Laptop, Black Desk

Step 2
General Objects: Silver Laptop, Black Desk
Text in the Image: N/A
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Silver Laptop, General Objects, is on top of, Black Desk, General Objects]

Step 4
(1) Node with max degree: Black Desk. 
(2) Location of Black Desk: [Center of the canvas].
(3) Location of Silver Laptop: [Center-top of the Black Desk].

Step 5
Bounding Boxes of the Objects:
Black Desk, General Objects: [0.100, 0.500, 0.900, 0.900] - The desk occupies the central lower part of the canvas.
Silver Laptop, General Objects: [0.300, 0.550, 0.700, 0.750] - The laptop is placed centrally on top of the desk.

Step 6
{"Black Desk": {"phrase": "Black Desk", "coordinates": [0.100, 0.500, 0.900, 0.900]},
 "Silver Laptop": {"phrase": "Silver Laptop", "coordinates": [0.300, 0.550, 0.700, 0.750]}}