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diff --git a/apps/advent2020/3b.mu b/apps/advent2020/3b.mu
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--- a/apps/advent2020/3b.mu
+++ /dev/null
@@ -1,137 +0,0 @@
-# https://adventofcode.com/2020/day/3
-#
-# To run (on Linux):
-#   $ git clone https://github.com/akkartik/mu
-#   $ cd mu
-#   $ ./translate_mu apps/advent2020/3a.mu
-#   $ ./a.elf < input
-#
-# You'll need to register to download the 'input' file for yourself.
-
-fn main -> _/ebx: int {
-  # represent trees in a 2D array of ints
-  # wasteful since each tree is just one bit
-  var trees-storage: (array int 0x2800)  # 10k ints
-  var trees/esi: (addr array int) <- address trees-storage
-  var trees-length/ecx: int <- copy 0
-  var num-rows: int
-  var width: int
-  # phase 1: parse each row of trees from stdin
-  {
-    var line-storage: (stream byte 0x40)  # 64 bytes
-    var line/edx: (addr stream byte) <- address line-storage
-    {
-      # read line from stdin
-      clear-stream line
-      read-line-from-real-keyboard line
-      # if line is empty (not even a newline), quit
-      var done?/eax: boolean <- stream-empty? line
-      compare done?, 0/false
-      break-if-!=
-      # wastefully recompute width on every line
-      # zero error-checking; we assume input lines are all equally long
-      copy-to width, 0
-      # turn each byte into a tree and append it
-      $main:line-loop: {
-        var done?/eax: boolean <- stream-empty? line
-        compare done?, 0/false
-        break-if-!=
-#?         print-int32-decimal 0, num-rows
-#?         print-string 0, " "
-#?         print-int32-decimal 0, width
-#?         print-string 0, "\n"
-        var dest/ebx: (addr int) <- index trees, trees-length
-        var c/eax: byte <- read-byte line
-        # newline comes only at end of line
-        compare c, 0xa/newline
-        break-if-=
-        # '#' = tree
-        compare c, 0x23/hash
-        {
-          break-if-!=
-          copy-to *dest, 1
-        }
-        # anything else = no tree
-        {
-          break-if-=
-          copy-to *dest, 0
-        }
-        increment width
-        trees-length <- increment
-        loop
-      }
-      increment num-rows
-      loop
-    }
-  }
-  # phase 2: compute
-  var product/edi: int <- copy 1
-  var result/eax: int <- num-trees-hit trees, width, num-rows, 1, 1
-  print-int32-decimal 0, result
-  print-string 0, " x "
-  product <- multiply result
-  var result/eax: int <- num-trees-hit trees, width, num-rows, 3, 1
-  print-int32-decimal 0, result
-  print-string 0, " x "
-  product <- multiply result
-  var result/eax: int <- num-trees-hit trees, width, num-rows, 5, 1
-  print-int32-decimal 0, result
-  print-string 0, " x "
-  product <- multiply result
-  var result/eax: int <- num-trees-hit trees, width, num-rows, 7, 1
-  print-int32-decimal 0, result
-  print-string 0, " x "
-  product <- multiply result
-  var result/eax: int <- num-trees-hit trees, width, num-rows, 1, 2
-  print-int32-decimal 0, result
-  print-string 0, " = "
-  product <- multiply result
-  print-int32-hex 0, product
-  print-string 0, "\n"
-  return 0
-}
-
-fn num-trees-hit trees: (addr array int), width: int, num-rows: int, right: int, down: int -> _/eax: int {
-#?   print-string 0, "== "
-#?   print-int32-decimal 0, right
-#?   print-string 0, " "
-#?   print-int32-decimal 0, down
-#?   print-string 0, "\n"
-  var row/ecx: int <- copy 0
-  var col/edx: int <- copy 0
-  var num-trees-hit/edi: int <- copy 0
-  {
-    compare row, num-rows
-    break-if->=
-#?     print-int32-decimal 0, col
-#?     print-string 0, "\n"
-    var curr/eax: int <- index2d trees, row, col, width
-    compare curr, 0
-    {
-      break-if-=
-      num-trees-hit <- increment
-    }
-    col <- add right
-    row <- add down
-    loop
-  }
-  return num-trees-hit
-}
-
-fn index2d _arr: (addr array int), _row: int, _col: int, width: int -> _/eax: int {
-  # handle repeating columns of trees
-  var dummy/eax: int <- copy 0
-  var col/edx: int <- copy 0
-  dummy, col <- integer-divide _col, width
-#?   print-string 0, "  "
-#?   print-int32-decimal 0, col
-#?   print-string 0, "\n"
-  # compute index
-  var index/eax: int <- copy _row
-  index <- multiply width
-  index <- add col
-  # look up array
-  var arr/esi: (addr array int) <- copy _arr
-  var src/eax: (addr int) <- index arr, index
-  return *src
-}