How to Cross River
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2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it? 
1. Both girls (G1, G2) cross => Both G1, G2 at other end
2. One girl (G1) returns => G2 at other end
3. One lady (L1) crosses => G2, L1 at other end
4. Second girl returns => L1 only at other end
5. Both girls cross again => G1, G2 and L1 at other end
6. One girl (G1) returns => G2 and L1 at other end
7. Other lady (L2) crosses => Both ladies (L1 and L2) and G2 at other end
8. Second girl returns again => Both ladies L1 and L2 at other end
9. Both girls cross again => Both ladies AND both girls reached other end, task completed.
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