diff --git a/lua/typstar/snippets/math.lua b/lua/typstar/snippets/math.lua
index ec01aac..9473880 100644
--- a/lua/typstar/snippets/math.lua
+++ b/lua/typstar/snippets/math.lua
@@ -20,6 +20,8 @@ return {
 
     -- boolean logic
     snip('no', 'not ', {}, math),
+    snip('ip', '==>> ', {}, math),
+    snip('ib', '<<== ', {}, math),
 
     -- relations
     snip('el', '= ', {}, math),
@@ -41,7 +43,8 @@ return {
     snip('bxx', 'times.square ', {}, math),
 
     -- sets
-    snip('set', '{<>}', { i(1) }, math),
+    -- 'st' to '{<>} in ./visual.lua
+    snip('set', '{<>|<>}', { i(1), i(2) }, math),
     snip('es', 'emptyset ', {}, math),
     snip('ses', '{emptyset} ', {}, math),
     snip('sp', 'supset ', {}, math),
diff --git a/lua/typstar/snippets/visual.lua b/lua/typstar/snippets/visual.lua
index d821bcf..e4c51af 100644
--- a/lua/typstar/snippets/visual.lua
+++ b/lua/typstar/snippets/visual.lua
@@ -15,6 +15,7 @@ local operations = {                            -- first boolean: existing brack
     { 'vi',  '1/',         '',  true,  false },
     { 'bb',  '(',          ')', true,  false }, -- add round brackets
     { 'sq',  '[',          ']', true,  false }, -- add square brackets
+    { 'st',  '{',          '}', true,  false }, -- add curly brackets 
     { 'bB',  '(',          ')', false, false }, -- replace with round brackets
     { 'sQ',  '[',          ']', false, false }, -- replace with square brackets
     { 'BB',  '',           '',  false, false }, -- remove brackets