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fix ch2 activity code 
#alpinehandbook
ch2.4 write-up #alpinehandbook
finish ch2.3 examples #alpinehandbook
ch2.4 examples #alpinehandbook
ch2.5 write-up #alpinehandbook
ch2.5 examples #alpinehandbook
ch2.1 write-up #alpinehandbook
ch2.6 examples #alpinehandbook
