Fri, 23 Mar 2018 14:04:50 +0100 wenzelm field "kind" is always present, with default "writeln";
Fri, 23 Mar 2018 11:39:41 +0100 nipkow merged
Fri, 23 Mar 2018 11:37:02 +0100 nipkow eliminated "elems"
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 tip