31. Village stratification is limited but based primarily on clan membership and wealth. 32. There were no significant indications of property and social stratification . 33. Social stratification in Japan became pronounced during the Yayoi period. 34. The presence of a main burial is a sign of social stratification . 35. The sloping and stratification create favorable conditions for the generation of landslides. 36. Large societies typically develop social stratification and dominance patterns among its subgroups. 37. Stratification within the social networks of scientists may skew the citation statistics.38. Mirrors adhere to the qualities of encapsulation, stratification and ontological correspondence. 39. Xie has contributed extensively to the field of social stratification . 40. The seeds require two months of cold stratification before use.