diff --git a/anagrams.tlv b/anagrams.tlv
new file mode 100644
index 0000000..1f0cd83
--- /dev/null
+++ b/anagrams.tlv
@@ -0,0 +1,336 @@
+# .tlv file generated by https://github.com/akkartik/teliva
+# You may edit it if you are careful; however, you may see cryptic errors if you
+# violate Teliva's assumptions.
+#
+# .tlv files are representations of Teliva programs. Teliva programs consist of
+# sequences of definitions. Each definition is a table of key/value pairs. Keys
+# and values are both strings.
+#
+# Lines in .tlv files always follow exactly one of the following forms:
+# - comment lines at the top of the file starting with '#' at column 0
+# - beginnings of definitions starting with '- ' at column 0, followed by a
+#   key/value pair
+# - key/value pairs consisting of '  ' at column 0, containing either a
+#   spaceless value on the same line, or a multi-line value
+# - multiline values indented by more than 2 spaces, starting with a '>'
+#
+# If these constraints are violated, Teliva may unceremoniously crash. Please
+# report bugs at http://akkartik.name/contact
+- __teliva_timestamp: original
+  str_helpers:
+    >-- some string helpers from http://lua-users.org/wiki/StringIndexing
+    >
+    >-- index characters using []
+    >getmetatable('').__index = function(str,i)
+    >  if type(i) == 'number' then
+    >    return string.sub(str,i,i)
+    >  else
+    >    return string[i]
+    >  end
+    >end
+    >
+    >-- ranges using (), selected bytes using {}
+    >getmetatable('').__call = function(str,i,j)
+    >  if type(i)~='table' then
+    >    return string.sub(str,i,j)
+    >  else
+    >    local t={}
+    >    for k,v in ipairs(i) do
+    >      t[k]=string.sub(str,v,v)
+    >    end
+    >    return table.concat(t)
+    >  end
+    >end
+    >
+    >-- iterate over an ordered sequence
+    >function q(x)
+    >  if type(x) == 'string' then
+    >    return x:gmatch('.')
+    >  else
+    >    return ipairs(x)
+    >  end
+    >end
+    >
+    >-- insert within string
+    >function string.insert(str1, str2, pos)
+    >  return str1:sub(1,pos)..str2..str1:sub(pos+1)
+    >end
+    >
+    >function string.remove(s, pos)
+    >  return s:sub(1,pos-1)..s:sub(pos+1)
+    >end
+    >
+    >-- TODO: backport utf-8 support from Lua 5.3
+- __teliva_timestamp: original
+  debugy:
+    >debugy = 5
+- __teliva_timestamp: original
+  dbg:
+    >-- helper for debug by print; overlay debug information towards the right
+    >-- reset debugy every time you refresh screen
+    >function dbg(window, s)
+    >  local oldy = 0
+    >  local oldx = 0
+    >  oldy, oldx = window:getyx()
+    >  window:mvaddstr(debugy, 60, s)
+    >  debugy = debugy+1
+    >  window:mvaddstr(oldy, oldx, '')
+    >end
+- __teliva_timestamp: original
+  check_eq:
+    >function check_eq(x, expected, msg)
+    >  if eq(x, expected) then
+    >    curses.addch('.')
+    >  else
+    >    print('F - '..msg)
+    >    print('  expected '..str(expected)..' but got '..str(x))
+    >    teliva_num_test_failures = teliva_num_test_failures + 1
+    >    -- overlay first test failure on editors
+    >    if teliva_first_failure == nil then
+    >      teliva_first_failure = msg
+    >    end
+    >  end
+    >end
+- __teliva_timestamp: original
+  eq:
+    >function eq(a, b)
+    >  if type(a) ~= type(b) then return false end
+    >  if type(a) == 'table' then
+    >    if #a ~= #b then return false end
+    >    for k, v in pairs(a) do
+    >      if b[k] ~= v then
+    >        return false
+    >      end
+    >      return true
+    >    end
+    >  end
+    >  return a == b
+    >end
+- __teliva_timestamp: original
+  str:
+    >-- smarter tostring
+    >-- slow; used only for debugging
+    >function str(x)
+    >  if type(x) == 'table' then
+    >    local result = ''
+    >    result = result..#x..'{'
+    >    for k, v in pairs(x) do
+    >      result = result..str(k)..'='..str(v)..', '
+    >    end
+    >    result = result..'}'
+    >    return result
+    >  end
+    >  return tostring(x)
+    >end
+- __teliva_timestamp: original
+  map:
+    >-- only for arrays
+    >function map(l, f)
+    >  result = {}
+    >  for _, x in ipairs(l) do
+    >    table.insert(result, f(x))
+    >  end
+    >  return result
+    >end
+- __teliva_timestamp: original
+  reduce:
+    >-- only for arrays
+    >function reduce(l, f, init)
+    >  result = init
+    >  for _, x in ipairs(l) do
+    >    result = f(result, x)
+    >  end
+    >  return result
+    >end
+- __teliva_timestamp: original
+  filter:
+    >-- only for arrays
+    >function filter(l, f)
+    >  result = {}
+    >  for _, x in ipairs(l) do
+    >    if f(x) then
+    >      table.insert(result, x)
+    >    end
+    >  end
+    >  return result
+    >end
+- __teliva_timestamp: original
+  find_index:
+    >function find_index(arr, x)
+    >  for n, y in ipairs(arr) do
+    >    if x == y then
+    >      return n
+    >    end
+    >  end
+    >end
+- __teliva_timestamp: original
+  trim:
+    >function trim(s)
+    >  return s:gsub('^%s*', ''):gsub('%s*$', '')
+    >end
+- __teliva_timestamp: original
+  split:
+    >function split(s, d)
+    >  result = {}
+    >  for match in (s..d):gmatch("(.-)"..d) do
+    >    table.insert(result, match);
+    >  end
+    >  return result
+    >end
+- __teliva_timestamp:
+    >Mon Feb 21 17:45:04 2022
+  sort_string:
+    >function sort_string(s)
+    >  tmp = {}
+    >  for i=1,#s do
+    >    table.insert(tmp, s[i])
+    >  end
+    >  table.sort(tmp)
+    >  local result = ''
+    >  for _, c in pairs(tmp) do
+    >    result = result..c
+    >  end
+    >  return result
+    >end
+    >
+    >function test_sort_string(s)
+    >  check_eq(sort_string(''), '', 'test_sort_string: empty')
+    >  check_eq(sort_string('ba'), 'ab', 'test_sort_string: non-empty')
+    >  check_eq(sort_string('abba'), 'aabb', 'test_sort_string: duplicates')
+    >end
+- __teliva_timestamp: original
+  append:
+    >-- concatenate list 'elems' into 'l', modifying 'l' in the process
+    >function append(l, elems)
+    >  for i=1,#elems do
+    >    l[#l+1] = elems[i]
+    >  end
+    >end
+- __teliva_timestamp: original
+  window:
+    >window = curses.stdscr()
+- __teliva_timestamp: original
+  doc:blurb:
+    >Show all anagrams of a given word
+- __teliva_timestamp: original
+  menu:
+    >-- To show app-specific hotkeys in the menu bar, add hotkey/command
+    >-- arrays of strings to the menu array.
+    >menu = {
+    >  {'^h', 'backspace'},
+    >}
+- __teliva_timestamp: original
+  word:
+    >word = ''
+- __teliva_timestamp: original
+  cursor:
+    >cursor = 1
+- __teliva_timestamp: original
+  main:
+    >function main()
+    >  while true do
+    >    render(window)
+    >    update(window)
+    >  end
+    >end
+- __teliva_timestamp: original
+  update:
+    >function update(window)
+    >  local key = curses.getch()
+    >  if key == curses.KEY_LEFT then
+    >    if cursor > 1 then
+    >      cursor = cursor-1
+    >    end
+    >  elseif key == curses.KEY_RIGHT then
+    >    if cursor <= #word then
+    >      cursor = cursor+1
+    >    end
+    >  elseif key == curses.KEY_BACKSPACE or key == 8 or key == 127 then  -- ctrl-h, ctrl-?, delete
+    >    if cursor > 1 then
+    >      cursor = cursor-1
+    >      word = word:remove(cursor)
+    >    end
+    >  elseif key >= 32 and key < 127 then
+    >    word = word:insert(string.char(key), cursor-1)
+    >    cursor = cursor+1
+    >  end
+    >end
+- __teliva_timestamp: original
+  render:
+    >function render(window)
+    >  window:clear()
+    >
+    >  local prompt_str = ' what is your name? '
+    >  curses.attron(curses.A_REVERSE)
+    >  window:mvaddstr(0, 0, prompt_str)
+    >  curses.attroff(curses.A_REVERSE)
+    >  window:addstr(' ')
+    >  curses.attron(curses.A_BOLD)
+    >  window:addstr(word)
+    >  curses.attroff(curses.A_BOLD)
+    >  window:mvaddstr(2, 0, '')
+    >  local results = anagrams(word)
+    >  if #results > 0 then
+    >    window:attron(curses.A_REVERSE)
+    >    print(#results..' anagrams')
+    >    window:attroff(curses.A_REVERSE)
+    >    for i, w in ipairs(results) do
+    >      window:addstr(w)
+    >      window:addstr(' ')
+    >    end
+    >  end
+    >
+    >  window:mvaddstr(0, string.len(prompt_str)+cursor, '')
+    >  curses.refresh()
+    >end
+- __teliva_timestamp:
+    >Mon Feb 21 17:42:28 2022
+  anagrams:
+    >function anagrams(word)
+    >  return gather(sort_string(word))
+    >end
+- __teliva_timestamp:
+    >Mon Feb 21 18:18:07 2022
+  gather:
+    >function gather(s)
+    >  if s == '' then return {} end
+    >  local result = {}
+    >  for i=1, #s do
+    >    if i == 1 or s[i] ~= s[i-1] then
+    >      local foo = combine(s[i], gather(take_out(s, i)))
+    >      append(result, combine(s[i], gather(take_out(s, i))))
+    >    end
+    >  end
+    >  return result
+    >end
+- __teliva_timestamp:
+    >Mon Feb 21 18:06:20 2022
+  take_out:
+    >function take_out(s, i)
+    >  if i < 1 then return string.sub(s, 1) end
+    >  return string.sub(s, 1, i-1) .. string.sub(s, i+1)
+    >end
+    >
+    >function test_take_out()
+    >  check_eq(take_out('', 0), '', 'take_out: empty')
+    >  check_eq(take_out('abc', 0), 'abc', 'take_out: invalid low index')
+    >  check_eq(take_out('abc', 4), 'abc', 'take_out: invalid high index')
+    >  check_eq(take_out('abc', 1), 'bc', 'take_out: first index')
+    >  check_eq(take_out('abc', 3), 'ab', 'take_out: final index')
+    >  check_eq(take_out('abc', 2), 'ac', 'take_out: middle index')
+    >end
+- __teliva_timestamp: original
+  combine:
+    >-- return 'l' with each element prefixed with 'prefix'
+    >function combine(prefix, l)
+    >  if #l == 0 then return {prefix} end
+    >  local result = {}
+    >  for _, elem in ipairs(l) do
+    >    result[#result+1] = prefix..elem
+    >  end
+    >  return result
+    >end
+    >
+    >function test_combine()
+    >  check_eq(combine('abc', {}), {'abc'}, 'test_combine: empty list')
+    >end
diff --git a/template.tlv b/template.tlv
index b17fd7d..630c66c 100644
--- a/template.tlv
+++ b/template.tlv
@@ -79,11 +79,11 @@
 - __teliva_timestamp: original
   check_eq:
     >function check_eq(x, expected, msg)
-    >  if x == expected then
+    >  if eq(x, expected) then
     >    curses.addch('.')
     >  else
     >    print('F - '..msg)
-    >    print('  expected '..tostring(expected)..' but got '..x)
+    >    print('  expected '..str(expected)..' but got '..str(x))
     >    teliva_num_test_failures = teliva_num_test_failures + 1
     >    -- overlay first test failure on editors
     >    if teliva_first_failure == nil then
@@ -91,6 +91,37 @@
     >    end
     >  end
     >end
+- __teliva_timestamp: original
+  eq:
+    >function eq(a, b)
+    >  if type(a) ~= type(b) then return false end
+    >  if type(a) == 'table' then
+    >    if #a ~= #b then return false end
+    >    for k, v in pairs(a) do
+    >      if b[k] ~= v then
+    >        return false
+    >      end
+    >      return true
+    >    end
+    >  end
+    >  return a == b
+    >end
+- __teliva_timestamp: original
+  str:
+    >-- smarter tostring
+    >-- slow; used only for debugging
+    >function str(x)
+    >  if type(x) == 'table' then
+    >    local result = ''
+    >    result = result..#x..'{'
+    >    for k, v in pairs(x) do
+    >      result = result..str(k)..'='..str(v)..', '
+    >    end
+    >    result = result..'}'
+    >    return result
+    >  end
+    >  return tostring(x)
+    >end
 - __teliva_timestamp: original
   map:
     >-- only for arrays
@@ -146,6 +177,35 @@
     >  end
     >  return result
     >end
+- __teliva_timestamp:
+    >Mon Feb 21 17:45:04 2022
+  sort_string:
+    >function sort_string(s)
+    >  tmp = {}
+    >  for i=1,#s do
+    >    table.insert(tmp, s[i])
+    >  end
+    >  table.sort(tmp)
+    >  local result = ''
+    >  for _, c in pairs(tmp) do
+    >    result = result..c
+    >  end
+    >  return result
+    >end
+    >
+    >function test_sort_string(s)
+    >  check_eq(sort_string(''), '', 'test_sort_string: empty')
+    >  check_eq(sort_string('ba'), 'ab', 'test_sort_string: non-empty')
+    >  check_eq(sort_string('abba'), 'aabb', 'test_sort_string: duplicates')
+    >end
+- __teliva_timestamp: original
+  append:
+    >-- concatenate list 'elems' into 'l', modifying 'l' in the process
+    >function append(l, elems)
+    >  for i=1,#elems do
+    >    l[#l+1] = elems[i]
+    >  end
+    >end
 - __teliva_timestamp: original
   window:
     >window = curses.stdscr()