Step 1
Objects: Black Mouse, Red Keyboard

Step 2
General Objects: Black Mouse, Red Keyboard
Text in the Image: N/A
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Black Mouse, General Objects, is on the left of, Red Keyboard, General Objects]

Step 4
(1) Node with max degree: Red Keyboard.
(2) Location of Red Keyboard: [Center of the canvas].
(3) Location of Black Mouse: [Left side of the Red Keyboard].

Step 5
Bounding Boxes of the Objects:
Red Keyboard, General Objects: [0.300, 0.400, 0.900, 0.600] - Positioned centrally in the canvas.
Black Mouse, General Objects: [0.100, 0.450, 0.250, 0.550] - Positioned to the left of the keyboard.

Step 6
{"Red Keyboard": {"phrase": "Red Keyboard", "coordinates": [0.300, 0.400, 0.900, 0.600]},
 "Black Mouse": {"phrase": "Black Mouse", "coordinates": [0.100, 0.450, 0.250, 0.550]}}