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ruby '-wex=i=1;20.times{p x;x+=i=x-i}'
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ruby '-wep 1,x=1;18.times{p x=(x/0.618).round}'
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ruby '-we20.times{|x|p((1.61803**x/1.382).round)}'
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dc -e1pd[pdk+Krlxx]dsxx|head -20
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dc -e1pd[rpdk+Kd6666\>x]dsxx
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dc -e1pd[rpdk+Kdv66\>x]dsxx
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dc -e1pd[pdk+KrdZ5\>x]dsxx
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dc -e1d[prdk+KdZ5\>x]dsxx