sprite dum [
`  x  x  `
`  x  x  `
`  x  x  `
`        `
`x      x`
` xxxxxx `
]

fun main(): u8 {
  var x = 0;
  var y = 27;
  var vx = 1;
  var vy = 0;
  var a = 1;
  while(1) {
    var draw_y = 32 - y;
    draw_sprite(dum, x, draw_y);
    set_delay(1);
    while(get_delay()){}

    vy = vy - a;
    y = y + vy;
    x = x + vx;
    if(6-y) {

    } else {
      var vtemp = vy;
      vy = 0 - vtemp;
      vy = vy + 1;
    }
    clear();
  }
}