Coral reefs are generally divided into four main types: fringing reef, barrier reef, atoll reef, and patch reef.
Hallstatt remains are generally divided into four phases (A, B, C, and D), although there is some disagreement among scholars as to how these phases should be dated.
Based on variation in footfall pattern, timing and cadence, these alternate gaits can be generally divided into four categories: pace, regular rhythm ambling, lateral ambling and diagonal ambling (Supplementary Notes and Supplementary Table 1).
Romanesque architecture in the Low Countries is generally divided into four stylistic classifications: the style of Meuseland, the Scheldt district style, the style of the bishopric of Utrecht, and the style prevalent in the provinces of Groningen and Friesland.
His career is generally divided into four periods, based on where he was working and his work was most prominently known.
E. coli strains are generally divided into four major phylogenetic groups A, B1, B2 and D [38], [39], although some strains may belong to additional groups [40], [41].
