定額

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achievement agreement background billboard black blackboard blank board box business card chalk chalkboard check checkbox checklist checkmark choice class classroom clipboard communication concept confirm confirmation correct cross data decision design do document educate education element empty form frame future icon illustration important information knowledge label learn lesson letter list mark meeting memo menu message nobody note notepad number object objects office option page paper paperwork pattern plan priorities project questionnaire red remind reminder report school shape sign solution space study studying success symbol tasks teach test text texture tick to to do underscore vote white wooden work write