diff --git a/asciimathml.py b/asciimathml.py
index e024ee0..172f1a5 100755
--- a/asciimathml.py
+++ b/asciimathml.py
@@ -490,6 +490,7 @@ def parse_m(s, required=False):
 symbols["delta"] = element_factory("mi", u"\u03B4")
 symbols["Delta"] = element_factory("mo", u"\u0394")
 symbols["epsi"] = element_factory("mi", u"\u03B5")
+symbols["epsilon"] = element_factory("mi", u"\u03B5")
 symbols["varepsilon"] = element_factory("mi", u"\u025B")
 symbols["eta"] = element_factory("mi", u"\u03B7")
 symbols["gamma"] = element_factory("mi", u"\u03B3")
@@ -687,7 +688,10 @@ def parse_m(s, required=False):
 symbols["uarr"] = element_factory("mo", u"\u2191")
 symbols["darr"] = element_factory("mo", u"\u2193")
 symbols["rarr"] = element_factory("mo", u"\u2192")
+symbols["->>"] = element_factory("mo", u"\u21A0")
 symbols["->"] = element_factory("mo", u"\u2192")
+symbols[">->>"] = element_factory("mo", u"\u2916")
+symbols[">->"] = element_factory("mo", u"\u21A3")
 symbols["|->"] = element_factory("mo", u"\u21A6")
 symbols["larr"] = element_factory("mo", u"\u2190")
 symbols["harr"] = element_factory("mo", u"\u2194")