pieces white chalk blackboard counting days quarantine during coronavirus outbreak |
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| navigate by keyword : academic background blackboard board care chalk chalkboard clean contagious corona coronavirus counting covid covid19 crisis danger days disease distance during education epidemic flat health infection lay lockdown marks ncovid object outbreak pandemic period pieces prevention quarantine restriction risk school social spread sticks study tally teach top view virus white world |
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| Pieces of white chalk on blackboard, flat lay. Counting days of quarantine during coronavirus outbreak |
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