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1=1

2=2

3=3

4=4

5=4+1

6=4+2

7=4+3

8=4+4

9=4+4+1 or 3+3+3

10=1+2+3+4

now 11 of course is 10 + 1 so 11=1+2+3+4+1

12 is =1+2+3+4+2

13=1+2+3+4+3 and so on

20=2*(1+2+3+4)

21 =(2*(1+2+3+4))+1 and so on

and 100=(1+2+3+4)*(1+2+3+4)

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12y ago

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