Step 1
Objects: Green Plant, Round Table

Step 2
General Objects: Green Plant, Round Table
Text in the Image: N/A
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Green Plant, General Objects, is on top of, Round Table, General Objects]

Step 4
(1) Node with max degree: Round Table.
(2) Location of Round Table: [Center of the canvas].
(3) Location of Green Plant: [Center-top of the Round Table].

Step 5
Bounding Boxes of the Objects:
Round Table, General Objects: [0.200, 0.400, 0.800, 0.800] - Positioned centrally in the canvas.
Green Plant, General Objects: [0.400, 0.200, 0.600, 0.400] - Positioned on top of the round table, centered above it.

Step 6
{"Round Table": {"phrase": "Round Table","coordinates": [0.200, 0.400, 0.800, 0.800]},
 "Green Plant": {"phrase": "Green Plant","coordinates": [0.400, 0.200, 0.600, 0.400]}}