22889
A range of desirable attributes of these glasses unfold from this finding ; in particular , a structural simplicity that will enable facile molecular engineering of rare - earth phosphate glasses with ' dial - up ' lasing properties .
 rare - earth phosphate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 rare - earth phosphate