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Use neg instead of "-"q)n:2q)(neg n)?n0 1q)select from tab[(neg n)?n]a � �b------nut �1bolt 2Thanks Rory

Hi Rory,You have to make the key of the dictionary into symbol format and also the rank error is due to the value d being all atoms and not list so these must be enlisted.q)d:{count each group y xbar x}q)x:1000?100q)k:d[x;10]q)k50| 9120| 10130| 11910...