ruby/hexadecimal (init)
ruby/hexadecimal (#1)
ruby/hexadecimal (#2) refactoring
ruby/hexadecimal (#3) consistent from_x methods
ruby/largest-series-product (init)
ruby/largest-series-product (#1)
ruby/largest-series-product (#2) raise error in proper place
ruby/kindergarten-garden (init)
ruby/kindergarten-garden (#1)