Maybe it's just my mental model, or being new to the language. But while going through SICP - 'cdadadr', 'cddaadr', etc. never really "clicked" in my mind. Really anything past 3 levels (cadar, cddar, etc.) always slowed down reading code, like hitting a speed bump.

I would have to stop and really try to grok what list item it was referring to. Not saying that that is a bad thing, just an observation.

Is there a common way of thinking that makes it easier to comprehend, or is it just something that comes with experience?