Step 1
Objects: Airplane(1), Airplane(2), Airplane(3), Airplane(4), Grassy Area

Step 2
General Objects: Airplane(1), Airplane(2), Airplane(3), Airplane(4), Grassy Area
Text in the Image: N/A
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Airplane(1), General Objects, is flying over, Grassy Area, General Objects]
[Airplane(2), General Objects, is flying over, Grassy Area, General Objects]
[Airplane(3), General Objects, is flying over, Grassy Area, General Objects]
[Airplane(4), General Objects, is flying over, Grassy Area, General Objects]

Step 4
(1) Node with max degree: Grassy Area.
(2) Location of Grassy Area: [Spanning the entire lower part of the canvas].
(3) Location of Airplane(1), Airplane(2), Airplane(3), Airplane(4): 
Airplane(1): [Upper left of the canvas];
Airplane(2): [Upper center-left of the canvas];
Airplane(3): [Upper center-right of the canvas];
Airplane(4): [Upper right of the canvas].

Step 5
Bounding Boxes of the Objects:
Airplane(1), General Objects: [0.100, 0.100, 0.300, 0.300]
Airplane(2), General Objects: [0.325, 0.100, 0.525, 0.300]
Airplane(3), General Objects: [0.550, 0.100, 0.750, 0.300]
Airplane(4), General Objects: [0.775, 0.100, 0.975, 0.300]
Grassy Area, General Objects: [0.000, 0.500, 1.000, 1.000]

Step 6
{
  "Airplane1": {"phrase": "Airplane","coordinates": [0.100, 0.100, 0.300, 0.300]},
  "Airplane2": {"phrase": "Airplane","coordinates": [0.325, 0.100, 0.525, 0.300]},
  "Airplane3": {"phrase": "Airplane","coordinates": [0.550, 0.100, 0.750, 0.300]},
  "Airplane4": {"phrase": "Airplane","coordinates": [0.775, 0.100, 0.975, 0.300]},
  "Grassy Area": {"phrase": "Grassy Area","coordinates": [0.000, 0.500, 1.000, 1.000]}
}