diff --git a/lectures/10/client.ml b/lectures/10/client.ml
new file mode 100644
index 0000000..ef4e85a
--- /dev/null
+++ b/lectures/10/client.ml
@@ -0,0 +1,41 @@
+(*
+org(123,BCIT)
+org(345,Hell Holdings\, Ltd)
+person(666,name(monty,burns))
+org(456,Ocaml \(LLC\))
+*)
+open Angstrom
+
+type name = Name of string * string
+type client = Person of int * name | Org of int * string
+
+let name first last = Name (first, last)
+let person id name = Person (id, name)
+let org id name = Org (id, name)
+
+let a_char =
+  (string "\\(" *> return '(') <|>
+  (string "\\)" *> return ')') <|>
+  (string "\\," *> return ',') <|>
+  (string "\\n" *> return '\n') <|>
+  satisfy (fun c -> c <> '(' && c <> ')' && c <> ',' && c <> '\n')
+
+let a_string =
+  many1 a_char >>| fun l -> l |> List.to_seq |> String.of_seq
+
+
+let uint = take_while1 (function | '0'..'9' -> true | _ -> false) >>| int_of_string
+
+let a_name = name <$> string "name(" *> a_string <* char ',' <*> a_string <* char ')'
+
+let a_person = person <$> string "person(" *> uint <* char ',' <*> a_name <* char ')'
+
+let an_org = org <$> string "org(" *> uint <* char ',' <*> a_string <* char ')'
+
+let a_client = a_person <|> an_org
+                                       
+let parse file =
+  let ic = open_in file in
+  let content = really_input_string ic (in_channel_length ic) in
+  parse_string ~consume:All (many (a_client <* end_of_line)) content
+
diff --git a/lectures/10/data b/lectures/10/data
new file mode 100644
index 0000000..2057fed
--- /dev/null
+++ b/lectures/10/data
@@ -0,0 +1,4 @@
+org(123,BCIT)
+org(345,Hell Holdings\, Ltd)
+person(666,name(monty,burns))
+org(456,Ocaml \(LLC\))
diff --git a/lectures/10/utils.ml b/lectures/10/utils.ml
new file mode 100644
index 0000000..be80695
--- /dev/null
+++ b/lectures/10/utils.ml
@@ -0,0 +1,42 @@
+open Angstrom
+
+let is_digit = function | '0'..'9' -> true | _ -> false
+
+let is_space = function | ' ' | '\t' -> true | _ -> false
+
+let ws = take_while is_space
+
+let ws1 = take_while1 is_space
+
+let uint_str = take_while1 is_digit
+
+let uint_num = uint_str >>| int_of_string
+
+let sign =
+  peek_char >>= function
+  | Some '+' -> advance 1 >>| fun () -> "+"
+  | Some '-' -> advance 1 >>| fun () -> "-"
+  | Some c when is_digit c -> return "+"
+  | _ -> fail "digit or sign expected"
+
+let int_str =
+  let* s = sign in
+  let* n = uint_str in
+  return (s ^ n)
+
+let int_num = int_str >>| int_of_string
+
+let dot =
+  peek_char >>= function
+  | Some '.' -> advance 1 >>| fun () -> true
+  | _ -> return false
+
+let float_str =
+  let* n = int_str in
+  let* is_dot = dot in
+  if is_dot then 
+    let* f = uint_str in return (n ^ "." ^ f)
+  else
+    return n
+
+let float_num = float_str >>| float_of_string