25599
On the basis of these reuslts , a mechanism for the ( de ) lithiation process is proposed , where Se is reduced to the polyselenides , Li2Sen ( n >= 4 ) , Li2Se2 , and Li2Se sequentially during the lithiation , and Li2Se is oxidized to Se through Li2Sen ( n >= 4 ) during the delithiation .
 Chemical: Se; Chemical: polyselenides; Chemical: Li2Sen; Chemical: Li2Se2; Chemical: Li2Se; Chemical: Li2Se; Chemical: Se; Chemical: Li2Sen
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: Se; Chemical: polyselenides; Chemical: Li2Sen; Chemical: Li2Se2; Chemical: Li2Se; Chemical: Li2Se; Chemical: Se; Chemical: Li2Sen