This form was derived through a combining of prior forms. The children fight back, using strategies combining medieval warfare with modern technology. These are some examples of combining a consonant with different vowels. It can be compared to mixing a curry, later combining it with semi-cooked rice separately. The canonical ordering is mainly concerned with the ordering of a sequence of combining characters. Others can be formed using the cedilla combining character. There is also a secondary focus on combining artificial systems with biological systems. This measures the difficulty of mixed climbs combining ice and rock. Additive synthesis builds sounds by combining several waveforms, usually sine waves, into a composite sound. Some vendors offer a position estimate based on combining several laterations. Bikes exist that blur the distinction by combining attributes of both, however. Some of these involved combining work from many fields. Hutchinson was also one of the first credited with combining ecology with mathematics. Zinc accomplishes this by combining readily with oxygen to form zinc oxide. Without such means of combining predictions, errors tend to multiply.