Read the excerpt below and answer the question.

TWO or three days and nights went by; I reckon I might say they swum by, they slid along so quiet and smooth and lovely. Here is the way we put in the time. It was a monstrous big river down there--sometimes a mile and a half wide; we run nights, and laid up and hid daytimes; soon as night was most gone we stopped navigating and tied up--nearly always in the dead water under a towhead; and then cut young cottonwoods and willows, and hid the raft with them. Then we set out the lines. Next we slid into the river and had a swim, so as to freshen up and cool off; then we set down on the sandy bottom where the water was about knee deep, and watched the daylight come. Not a sound anywheres--perfectly still --just like the whole world was asleep, only sometimes the bullfrogs a-cluttering, maybe. (p. 114)

In at least 150 words, discuss how Twain uses the Mississippi River as a symbol for freedom in this passage, and explain how the river functions in the novel. Cite examples from the novel to support your response.