Make a dictionary of all the words from the below paragraph, which are having 4 or more letters in it.

(a) Key of the dictionary should be word and value should be the number of times that word has appeared in the paragraph, sort the dictionary in descending order. eg. {'girls': 2, 'part': 2, 'equal': 2, "it's": 1}
(b) Write a brief explanation walking through your code's logic in markdown.

Paragraph = " " "It's the Spice Girls part but not as you know them. Twenty years after it was first released, I this famous girl power anthem has been given a 21st century feminist makeover. I The new video is part of Project Everyone's campaign to improve the lives of women and girls everywhere, \ calling for an end to violence against girls, quality education for all and equal pay for equal work.""