[Vala] tuple in list manipulation question

[san hoi <hoisan49 gmail com>]

1. string => string[] => List(Tuple(a1,b1), ...) => Dict(a1: b1, ...) items
2. string => string[] => List(Tuple(a1,b1,c1), ...) => double loop

I would like to do well in first case.
Is there a better way to do this? Regards.

[1] http://codepad.org/md9P4cTf
[2] http://codepad.org/bHUR2Dgg