9 9% 9 9 8&'# !(&# ))) 8!!*# $ + 9 1% , 9 -, 8!"8-, 8!!*-9.% /" 8' () !8* 8/ 8( " 0 9 88 '' 81 ) 0 !"* 8& ( 6 ' () !' * )& * " 2 9 & /
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Alan S. Kaye (1999) studied this question.