TinyMCE won't let me superscript and strips out my sup tags

Question

I downloaded TinyMCE latest version 4.3 from https://www.tinymce.com/ .

Everything is working fine but for some reason it wont let me superscript at a start of a sentence and it sometimes lets me superscript at the end of the sentence. I can't duplicate the conditions.

When I try to go into code enter the sup tags it strips them out.

 <sup>1</sup>wont allow blah blah blah sometimes allow<sup>1</sup>

How do i disable stripping out/removing my super scripts

Answer 1

my mistake in my config file

i had set

valid_children:  p[strong|a|#text|br] 

i just add to add sup to to that list before i had

valid_children:  p[strong|a|#text|br],sup 

should be

valid_children:  p[strong|a|#text|br|sup]