Kaomojis
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#universal decimal classification
#UDC
#library science
#knowledge organization
#classification system
#bibliography
#decimal system
#libraries
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#ten digits
#base 10
#decimal system
#numeral set
#digits
#1234567890
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#decimal system
#mathematical system
#number theory
#arithmetic system
#number rules
#positional notation
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#place value
#tens place
#base 10
#number place
#decimal system
#universal decimal classification #UDC #library science #knowledge organization #classification system #bibliography #decimal system #libraries