> REPL is poking at the problem through a tiny keyhole and Light Table is opening the door and shining the light on the full behavior of the code. I thought th

> REPL is poking at the problem through a tiny keyhole and Light Table is opening the door and shining the light on the full behavior of the code. I thought there were quite a lot of problems in the algorithms of data structures where you poke around with a hair-pin.