Fri, 12 Apr 2019 19:26:13 +0100 test of
Chengsong [Fri, 12 Apr 2019 19:26:13 +0100] rev 13
test of retrieve r v = retrieve (bsimp r) (decode bsimp r code v)
(0) -10 -1 +1 +10 +30 +100 tip