[ltdanimal]

I think you have that flipped. 20% of code covers 80%. As you try to get to 100% coverage of all possible scenarios the complexity gets in some cases exponentially harder as all the low hanging fruit is picked

[the-dude]

So he is exactly right : 80% of the code handles edges cases. You are the one who is flipped.

[cozzyd]

20% of code covers 80%. 80% of code covers 19%.