I think the famous rule for short memory capacity (we can on average keep 7 words/numbers/objects in out short memory) should also apply here. Up to 7 words/ope

I think the famous rule for short memory capacity (we can on average keep 7 words/numbers/objects in out short memory) should also apply here. Up to 7 words/operators per line, up to 7 lines for a function etc. are optimal.