mix lines verbose by rotary-o

var s,t=""
while(0<1)println{t=readLine
s=(""/:(t*7 zip s*2+0))((z,a)=>z+a._1+a._2)take Seq(s.size*2,t.size*2-1).max
s}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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