Write 0;
Write 1;
Write 2;
Write 3;
Write 4;
Write 5;
Write 6;
Write 7;
Write 8;
Write 9;
Write 10;
Write 11;
Write 12;
Write 13;
Write 14;
Write 15;
Write 16;
Write 17;
Write 18;
Write 19;