Revert "Coding the Matrix => Week 4 => Homework 4 => Span of Vectors"

This reverts commit 720622f6bf69340fb59643db366111ab3029790c.

Conflicts:
	Coding the Matrix/Week 4 The Basis/Homework 4/hw4.py

Signed-off-by: CyberZHG <443442708@qq.com>