1. AOI KOSHIGAYA
I`m very interested in information tecnology, especially web and Android development. 
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©2. AYA KOSHIGAYA
I am a PhD student in the mathematics program at University of Wisconsin-Madison. I am interested in categorical logic, type theory, and topos theory. 
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CITY SOCIETY OF COMMERCE AND INDUSTRY KOSHIGAYA
4. COST KOSHIGAYA
6. nameshiko KOSHIGAYA