code: @Override
  	public void add (Schedulable schedulable, int frequency, int phase) {
  		add(schedulable, frequency, phase, 1f);
  	}
docs: Adds the {@code schedulable} to the list using the given {@code frequency} and {@code phase} with priority 1.
  @param schedulable the task to schedule
  @param frequency the frequency
  @param phase the phase