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

fun main(): u8 {
  var x = 0;
  var y = 5;
  var vy = 0;
  var ay = 1;
  var mode = 0;
  while(1) {
    draw_sprite(dum, x, y);
    set_delay(1);
    while(get_delay()){}
    draw_sprite(dum, x, y);
    if(5 - y) {

    } else {
        mode = 0;
    }
    if(26 - y) {

    } else {
        mode = 1;
    }
    if(mode) {
        vy = vy - ay;
        y = y - vy;
    } else {
        y = y + vy;
        vy = vy + ay;
    }
  }
}