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Veröffentlicht: 2009-03-09 18:53:18.408808
Kategorie: School
Typ: Foto
Model release: NEIN
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logarithm formula on a school blackboard
Schlüsselwörter
logarithm,
multiplication,
addition,
background,
black,
blackboard,
calculus,
chalk,
blackboard,
definition,
dust,
formula,
handwriting,
horizontal,
mathematic,
nobody,
pattern,
smudge,
texture,
white
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