Occasionally, the "B" section will end with a "return" of the opening material from the "A" section. This is referred to as rounded binary, and is labeled as "ABA"′. In rounded binary, the beginning of the "B" section is sometimes referred to as the "bridge", and will usually conclude with a half cadence in the original key. Rounded binary is not to be confused with ternary form, also labeled "ABA"—the difference being that, in ternary form, the "B" section contrasts completely with the "A" material as in, for example, a minuet and trio. Another important difference between the rounded and ternary form is that in rounded binary, when the "A" section returns, it will typically contain only half of the full "A" section, whereas ternary form will end with the full "A" section.