I have checked core for this answer and there is not a specific logic behind this but there is a explanation that author has stated and it is based on examples and the graphical depiction that the author has given in the topic so for your reference you can refer to TOPIC 9 of the core from the same chapter.
This is explained by Sir by taking an example in the class please refer to the class notes
Can you please explain
Sure I’ll record an audio explanation for the same and upload it
Please
I have checked core for this answer and there is not a specific logic behind this but there is a explanation that author has stated and it is based on examples and the graphical depiction that the author has given in the topic so for your reference you can refer to TOPIC 9 of the core from the same chapter.