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It is in ...
Abhidhanappadipika is a Glossary explanation.
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Anguththara Nkaya 3.2.3.10. Ananda wagga 10. chulanika suththa. sahassi loka dhathu, dwi sahassi loka dhathu > Describe galaxies.
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Abhidharmarthapradipika can be read here in four volumes, but it is all in Sinhalese. You will need to find a translator or someone who can read it for you. I don't know if it has been translated.
http://m.budaedu.org/ebooks/p6-2-SR.php (search this for "PRADIPIKA") http://ftp.budaedu.org/ebooks/pdf/SR041.pdf (Vol. 1)
The rest of the volumes are on the first link.