I have read in "Ukrainian - A Comprehensive Grammar" by S. M. Pugh and I. Press that some Ukrainian inanimate nouns, such as лист, can optionally take singular-accusative in -а, i.e. they are treated gramatically as animate nouns. In this question I'll call this feature 'facultative animacy'. I would like to know how common facultative animacy is: are there a lot of nouns such as лист? Do such nouns belong to specific classes with common meanings? What is the perceived stylistic difference (if any) of facultative animacy?