The games form a trilogy with a continuous story throughout each.

It will be the last in the series, forming a trilogy.

These monographs form a trilogy on gender, religion, and the meanings of knowing.

Rodriguez has been writing since 1973 and his books form a trilogy.

Among his most significant works are the three scale vocal compositions that form a trilogy.

These books don't form a trilogy; they have neither character nor setting in common.

They are meant to form a loose trilogy.

The films do not form a trilogy in the traditional sense, as there is no relationship between the plot of each film.

The second through fourth films loosely form a trilogy, with the later plots building on elements of the earlier ones.

The books do not form a trilogy, but rather are three stand-alone paperbacks following the same group of characters.