Is it possible to use a negative integer for the Mask of the Split Tree component for instance as it is possible for the List item component? For instance, I’d like to get this result; {*}[(<3)or(>-3)], but seems the mask doesn’t accept negative value. Or there is only the Path Statistic component that can help, but it’s not the convenient way at all…
@martinsiegrist First of all, thank you for your reply, but I know about the Path Statistic comp, you don’t get my question, I want to get this logic like this {*}[(>=-3)] which means for any path, want to get three last items
Please upload here a sequence with tree data. 
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@HS_Kim Thank you! It is a solution indeed but workaround solution, seems there are no possibilities to use simple syntaxes for Mask
Can this work ?
MaskFirstaLast.gh (7.8 KB)
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@eddi Neat solution as well
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@martinsiegrist Yea, maybe the simplest solution 
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@DavidRutten are negative numbers for the SplitTree going to be implemented in GH2?
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