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Pls help me pls pls pls

Pls Help Me Pls Pls Pls class=

Answer :

Answer:

1. 1 and 2;  2 and 3

2. 4 and 5;  5 and 6

3.  7 and 8;  8 and 9

4.  1 and 3;  2 and 4

Step-by-step explanation:

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