homework7

loop separately

1. ww1.sinaimg.cn/bmiddle/005Cn0dNgw1exiepud2hwg308c08n3ze.gif

2.

ww1.sinaimg.cn/bmiddle/005Cn0dNgw1exiepy8owzg308c07hdgh.gif

3.

ww4.sinaimg.cn/bmiddle/005Cn0dNgw1exiepw80dvg308c06owez.gif

Done