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diff --git a/src/pretty.mli b/src/pretty.mli
new file mode 100644
index 0000000..87a2558
--- /dev/null
+++ b/src/pretty.mli
@@ -0,0 +1,32 @@
+exception InvalidUtf8Codepoint of int
+
+val subscript : int -> string
+val superscript : int -> string
+val down_arrow : string
+val up_arrow : string
+val right_arrow : string
+val left_arrow : string
+val epsilon : string
+val cap : string
+val cup : string
+val lnot : string
+val wedge : string
+val vee : string
+val top : string
+val bottom : string
+val dummy : string
+val double_right_arrow : string
+val overline : string -> string
+val underline : string -> string
+val strike : string -> string
+val padding : int -> string
+val line : int -> string
+val length : string -> int
+val pp_overline : Format.formatter -> string -> unit
+val pp_underline : Format.formatter -> string -> unit
+val pp_strike : Format.formatter -> string -> unit
+val pp_subscript : Format.formatter -> int -> unit
+val pp_superscript : Format.formatter -> int -> unit
+
+val print_list : ?sep:string -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a list -> unit
+val print_array : ?sep:string -> (Format.formatter -> 'a -> unit) -> Format.formatter -> 'a array -> unit