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From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: \tlist_head_ii:n?
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Hello all,

I see that expl3 has \tlist_head_i:n and \tlist_head_iii:n, but no
\tlist_head_ii:n.  For at least one or two things, it would be handy.  Is
there a reason for this selection of head functions?
-- 
Joseph Wright