https://www.dropbox.com/s/rx4eaz9aqhme8gr/Ch15.ppt?dl=0
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https://www.dropbox.com/s/g558g46oew4zibo/Ch17.ppt?dl=0
https://www.dropbox.com/s/lm0g8x222e71fhk/Ch18.ppt?dl=0
https://www.dropbox.com/s/mgs05lhvhpu4f22/Ch19.ppt?dl=0
https://www.dropbox.com/s/rcirbc7b3e39vl9/Ch20.ppt?dl=0
https://www.dropbox.com/s/ga7toowe39dib9t/Ch21.ppt?dl=0
https://www.dropbox.com/s/f96mmx0mwkxbcci/Ch22.ppt?dl=0
https://www.dropbox.com/s/vftnyt1si5fdat5/Ch23.ppt?dl=0
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