Matched context for advanced and difficult

The page lists matched contexts for advanced and difficult.

Share - advanced	Share - difficult	Phrase
5.06%	0.51%	{advanced or difficult} [difficulty] system
3.77%	0.13%	{advanced or difficult} [difficulty] cylinder
1.34%	0.34%	{advanced or difficult} [difficulty] engine
1.45%	0.41%	{advanced or difficult} [difficulty] ignition
0.23%	1.82%	more {advanced or difficult}