31. The verb is preceded by a chain of invariable particles expressing tense, polarity and mood. 32. Race is one of the invariable features that contribute to categorical perception in conjunction with expression. 33. The invariable knee-jerk reaction could also pose a danger-you just never know. 34. However, the two deposits are invariable separated by a minimum of of clay shale and silt. 35. Although the Advocate General's advice is not binding, the ECJ almost invariable follows it. 36. Spectacle seems an intrinsic element, or at least an invariable dramatic byproduct, of any musical requiem. 37. Sundays were invariable : roast beef, peas, Brussels sprouts and a steaming pan of Yorkshire pudding. 38. This difference is neither temporary nor merely practical; it is an invariable and natural property of everything. 39. It is an invariable custom that the Lord Mayor of London must previously have served as a Sheriff. 40. Unlike nouns, adjectives do not have invariable prefixes that are essential to their identity as a word.