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School chemistry lesson. Test tubes with substances. Formal education. Girls and boy student conduct school experiment with liquids. School laboratory. Group school pupils study chemical liquids.
Formal education. Girls and boy student conduct school experiment with liquids. School laboratory. Group school pupils study chemical liquids. School chemistry lesson. Test tubes with substances.
Formal education. School laboratory. Group school pupils study chemical liquids. Girls and boy student conduct school experiment with liquids. School chemistry lesson. Test tubes with substances.
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Group school pupils study chemical liquids. School chemistry lesson. Test tubes with substances. Formal education. Girls and boy student conduct school experiment with liquids. School laboratory.
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