tasks a-s
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init() {echo > fifo}
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push() {echo $1 >> fifo }
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pop() {head -1 fifo ; (cat fifo | tail -n +2)|sponge fifo}
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empty() {cat fifo | wc -l}
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push me; push you; push us; push them
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|pop;pop;pop;pop
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me
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you
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us
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them
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