! DPI_AWARENESS_CONTEXT experimentally:
! USE: ranges -100 1000 [a..b] [ <alien> IsValidDpiAwarenessContext ] zip-with
-! [ nip 0 > ] assoc-filter keys .
+! [ 0 > ] filter-values keys .
! { -5 -4 -3 -2 -1 17 18 34 273 529 785 }
! -4 <alien> 34 <alien> AreDpiAwarenessContextsEqual . ! t