"includes mostly" is a correct and usable phrase in written English.
You can use it when referring to a group of things that are made up of mostly one type of item. For example: "The menu includes mostly desserts."
Its streaming catalog includes mostly content that is more than a year old.
The menu includes mostly appetizers and pastas (noodles by another name) and only two rotating entrées.
The other half includes mostly smallish workshops where conditions tend to be worse.
Until they reach the N.B.A., their windfall includes mostly sneakers and apparel.
The Performa Biennial, through Nov. 21, includes mostly avant-garde arts events around the city.
The bid by the Royal Bank of Scotland consortium includes mostly cash and would result in a breakup of ABN Amro.
The archive includes mostly British and international news stories, although "it also has an extraordinary amount of American news," said Peter Fydler, British Pathe's commercial director.
The 13-artist roster, selected by a painter, Doug Wada, includes mostly familiar names but a refreshingly diverse range of images and ideas.
Series A includes mostly overlong misfires, starting with Kia Corthron's pedestrian political drama, "Trickle," which schematically analyzes the ripple effect of the collapsing economy on ordinary people with the imagination of a connect-the-dots picture book.
While the band of eight includes mostly instruments that might be found in a classical ensemble (cello and viola, clarinet and oboe and piano), the music matches the boho-hip flavor of the sometimes slangy lyrics.
The festival will extend through Feb. 5 and includes mostly local productions of most of his operas, including many rarities, as well as concerts, a symposium and notable guest artists.
