modifying hw 2:
more efficient in memory
hw 4 commit 1
rename
rename
sphere finish.
cube added
hw 4 person is not finished
person is not finished
hw 5 finish
hw5 add interface
ignore
Merge pull request #1 from kanwangkerry/hw5

Hw5
delete unused statement
heart misapplet
almost finish, but everything so slow
bug fixed
no
a
have error
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