logotype line chalkboard with function mathematical icon isolated black background school blackboard sign logo |
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| navigate by keyword : blackboard chalkboard board chalk mathematics function design symbol vector illustration icon isolated logo logotype brand template idea element card line linear contour outline art lineart blank education school background classroom frame class flat empty object space wood wooden sign retro billboard copy banner business concept dirty lesson old back graphic |
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| Logotype line Chalkboard with function mathematical icon isolated on black background. School Blackboard sign. Logo design template element. Vector Illustration. |
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