Blackboards; Blackboards, drawing boards and easels; Drawing boards; Drawing instruments; Drawing paper; Drawing pens; Drawing rulers; Educational books featuring mathematics; Magnetic boards; Manuals in the field of instructional math; Paint boxes for use in schools; Wet erase writing boards; Writing brushes; Writing ink; Writing instruments; Writing pads; Writing paper

'blackboard':1,2 'board':4,8,22,39 'book':18 'box':31 'brush':41 'draw':3,7,9,11,13,15 'easel':6 'educ':17 'eras':37 'featur':19 'field':26 'ink':43 'instruct':28 'instrument':10,45 'magnet':21 'manual':23 'math':29 'mathemat':20 'pad':47 'paint':30 'paper':12,49 'pen':14 'ruler':16 'school':35 'use':33 'wet':36 'write':38,40,42,44,46,48

XZHAO

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