hyphen in subscript    
   Sometimes, the hyphen as subscript doesn't appear : see the A_- in the fragment
sage: pp=  Graphics()
sage: pp+=text("$A_-$",(0,0),axes=False,fontsize=20)
sage: pp+=text("$B_-C_+$",(1,0),axes=False,fontsize=20)
sage: pp
Some hint ?
lg
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