2tens + 1ten
20 + 10
1ten + 3ones
10 + 3
3tens + 3tens
30 + 30
2tens + 4ones
20 + 4
4tens + 4tens
40 + 40
1ten + 5ones
10 + 5
2tens + 2tens
20 + 20
3tens + 3ones
30 + 3
5tens + 5tens
50 + 50
4tens + 5ones
40 + 5
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