LOGICAL useStevensEast
& useStevensEast,useStevensWest,
IF ( useStevensEast ) THEN
& useStevensEast.OR.useStevensWest) THEN
IF ( tileHasOBE(bi,bj) .AND. useStevensEast ) THEN
& .OR. ( useStevensEast.AND.useOrlanskiEast )
useStevensEast =.FALSE.
& .OR. useStevensEast .OR. useStevensWest )