However, since the context of an OOV word is unknown and it therefore cannot be assigned to a cluster, OOV words are as much a problem to a context-based class model as to a word model.
in related work, factored language models (Bilmes and Kirchhoff, 2003) were proposed to make use of morphological information in highly inflecting languages such as Finnish (Creutz et al., 2007), Turkish (Creutz et al., 2007;Yuret and Biçici, 2009) and Arabic (Creutz et al., 2007;Vergyri et al., 2004) or compounding languages like German (Berton et al., 1996).