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+Use the same size increases for sum prod int as eqn does.
+
+Perhaps chartype should be renamed.
+
+TeX makes {sub,super}script on a single character with an accent
+into an accent onto the (character with the script). Should we do this?
+
+Implement mark and lineups within scripts, matrices and piles, and accents.
+(Why would this be useful?)
+
+Perhaps push hmotions down through lists to avoid upsetting spacing
+adjustments.
+
+Possibly generate .lf commands during compute_metrics phase.
+
+Consider whether there should be extra space at the side of piles.
+
+Provide scriptstyle displaystyle etc.
+
+Provide a nicer matrix syntax, e.g.,
+matrix ccc {
+a then b then c above
+e then f then g above
+h then i then k
+}
+
+Perhaps generate syntax error messages using the style of gpic.
+
+Wide accents.
+
+More use of \Z.
+
+Extensible square roots.
+
+Vphantom
+
+Smash.
+
+Provide a variant of vec that extends over the length of the accentee.
+
+Support vertical arrow delimiters.
+
+Make the following work:
+.EQ
+delim @@
+.EN
+.EQ @<-@
+some equation
+.EN