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What is the approximate mass of 8 $1 coins?

What is the last digit of \(1226^{2016} \)?

\[ \large{\begin{array}{ccccccc} && & & R &F \\ \times& & & & A&F\\ \hline & & & L & E&S\\ & & & E & L&\\ \hline & & & S & S&S\\ \end{array}} \]

\[\large{2016+2015+2014-2013-2012-2011 + \dots \\ \dots+6+5+4-3-2-1= \ ?}\]

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