[PD] splitting a list into pairs of two

[i go bananas]

not sure if there is a super simple way to do this, but this patch looks
like it works:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20121003/a5e7d7c5/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: list_pair.pd
Type: application/octet-stream
Size: 751 bytes
Desc: not available
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20121003/a5e7d7c5/attachment.obj>