diff --git a/src/day_3.jl b/src/day_3.jl
index 0e16021..21c0e81 100644
--- a/src/day_3.jl
+++ b/src/day_3.jl
@@ -18,23 +18,23 @@ end
 function p2(input::Vector{String})
   i1 = copy(input)
   i2 = copy(input)
-  ox = ""
-  co = ""
+  o₂ = ""
+  co₂ = ""
   for i in 1:length(input[1])
-    oxbits = map(x -> parse(Int, x[i]), i1)
-    cobits = map(x -> parse(Int, x[i]), i2)
+    o₂bits = map(x -> parse(Int, x[i]), i1)
+    co₂bits = map(x -> parse(Int, x[i]), i2)
     
-    oxmc = sum(oxbits) >= length(oxbits) / 2 ? '1' : '0'
-    comc = sum(cobits) >= length(cobits) / 2 ? '0' : '1'
+    o₂mc = sum(o₂bits) >= length(o₂bits) / 2 ? '1' : '0'
+    co₂mc = sum(co₂bits) >= length(co₂bits) / 2 ? '0' : '1'
 
-    filter!(x -> x[i] == oxmc, i1)
-    filter!(x -> x[i] == comc, i2)
+    filter!(x -> x[i] == o₂mc, i1)
+    filter!(x -> x[i] == co₂mc, i2)
 
-    length(i1) == 1 && ox == "" ? (ox = i1[1]) : nothing
-    length(i2) == 1 && co == "" ? (co = i2[1]) : nothing
-    ox != "" && co != "" ? break : continue
+    length(i1) == 1 && o₂ == "" ? (o₂ = i1[1]) : nothing
+    length(i2) == 1 && co₂ == "" ? (co₂ = i2[1]) : nothing
+    o₂ != "" && co₂ != "" ? break : continue
   end
-  parse(Int, ox; base=2) * parse(Int, co; base=2)
+  parse(Int, o₂; base=2) * parse(Int, co₂; base=2)
 end
 
 @aoc(2021, 3)