24584
Annealing of implanted structures to 900 K induces the formation of highly regular holes of 2 nm diameter in the h - BN layer with adjacent flakes of the same size found on top of the layer .
 Chemical: h - BN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: h - BN