blackboard with chalk white background top view 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 study tally teach top view virus white wooden world |
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| Blackboard with chalk on white wooden background, top view. Counting days of quarantine during coronavirus outbreak |
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