wrap(s,len)={
  my(t="",cur);
  s=Vec(s);
  for(i=1,#s,
    if(s[i]==" ",
      if(cur>#t,
        print1(" "t);
        cur-=#t+1
      ,
        print1("\n"t);
        cur=len-#t
      );
      t=""
    ,
      t=concat(t,s[i])
    )
  );
  if(cur>#t,
    print1(" "t)
  ,
    print1("\n"t)
  )
};
King="And so let freedom ring from the prodigious hilltops of New Hampshire; let freedom ring from the mighty mountains of New York; let freedom ring from the heightening Alleghenies of Pennsylvania; let freedom ring from the snow-capped Rockies of Colorado; let freedom ring from the curvaceous slopes of California. But not only that: let freedom ring from Stone Mountain of Georgia; let freedom ring from Lookout Mountain of Tennessee; let freedom ring from every hill and molehill of Mississippi. From every mountainside, let freedom ring.";
wrap(King, 75)
wrap(King, 50)