[pipes,'/cs/www/classes/cs372/spring16/a10/pipestest'].
case1.
run.
echo.
cut(x,10,y).
weld(x,y).
weld(a,x).
cut(a,5,b).
cut(a,10,a2).
cut(x,10,a2).
trim(a,15).
weld(a,c).
q.