Rearrange the following six sentences: 1) Its current was very powerful and could take away big tree trunks. 2) There were some children, playing on the bank of the waterway. 3) In the forest of Sonagaji, there is a big lake. 4) The excess water started flowing forcefully through the waterway. 5) Once there was a very heavy rain because of which the lake started overflowing. 6) A poor man noticed it and rushed to save them. Q: Which of the following should be the second sentence?