underleftrightarrow decoration none amsmath
underline decoration none
underrightarrow decoration none amsmath
+#Do not load automatically, it redefines some other symbols, and we don't
+#have a possibility to turn automatic loading off like for ams
+#undertilde decoration none accents
+undertilde decoration none
#Do not load automatically, since it might conflict with user macros and we
#don't have a possibility to turn automatic loading off like for ams
#utilde decoration none undertilde