Exercise #6 step #3
exercise #6 step #4 - now everything is complete

It is a bit of a mess though :(
cleaning up exercise #6 a bit.
Chapter 12 - Lazyness - exercises #1 & #2
exercise #3 - making an eager form of my lazy filter
finishing exercises 12.6
with help from the solution - solved this exercise

was confused by the value i was getting as step-value