Matched context for material and surface

The page lists matched contexts for material and surface.

Share - material	Share - surface	Phrase
1.45%	0.75%	friction {material or surface}
0.68%	0.19%	{material or surface} layer
0.40%	0.18%	{material or surface} [does] have
0.25%	0.12%	abrasive {material or surface}
0.13%	0.22%	sealing [purpose] {material or surface}