void main() {
    String bar = "";

    for (int i = 0; i < 10; i++) {
        bar += "#";
        IO.println(bar);
    }
}

// From Groundwork, chapter 5 (ch05-repetition), box 12.
// This example is from Groundwork, licensed CC BY-NC-SA 4.0.
// Run with: java ch05_12.java