ACKNOWLEDGMENTS 



The author would, like to thank David Mitchell, Eric Moore, Ronald 

 Sonoda, and James Thomas, for this work would not have been so enjoyable, 

 or even possible, without the patience and tolerance they have demon- 

 strated during the course of these studies. 



The love, friendship, and expert advice provided by the author's 

 wife, Kathy, have made the difficult times pass with little notice, and 

 the good times treasured forever. 



The author especially is grateful towards his parents , for the 

 guidance and support they have provided so consistently. 



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