Topic 1: number and operations:
1.1 1.2 number of merge and split the Group
2. Strand 2: measurements and weight, volume, length, 2.1 2.2 2.3 fiscal time
3. Strand 3: geometry: 3.1 the position, direction and distance 3.2 three dimensional geometry model and a two-dimensional geometry
4. Strand 4: Algebra
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