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L-99: Ninety-Nine Lisp Problems

#1

P01 - Find the last box of a list

#3

#5

P05 - Reverse a list

#7

#10

P10 - Run-length encoding of a list

#11

P11 - Modified run-length encoding

#12

#14

#16

#18

P18 - Extract a slice from a list

#19

#20