SEM
From Icelandic Parsed Historical Corpus (IcePaHC)
When sem means 'as' or 'like', as in sem barn 'as a child' and results in a gapped structure, treat sem as a complementizer that introduces a CP-ADV clause which does not have to contain a subject, cf. the example below:
(IP-SUB (NP-SBJ (PRO-N hann-hann)) (MDDS skyldi-skulu) (NP-OB1 (PRO-D henni-hún)) (VB fylgja-fylgja) (CP-ADV (WADVP-4 0) (C sem-sem) (IP-SUB (ADVP *T*-4) (NP-OB1 (NP-POS (PRO-D sinni-sinn)) (N-D móður-móðir)))))))))