Update README.md

README.md

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 umLabeller is an inspection tool for characterizing the semantic compositionality of subword tokenization,
 based on the morphological information retrieved from UniMorph. 
-Given a word _w_ and its subword tokenization, _s_ = (_s1_, ..., _sn_) | ∀i _si_ ∈ V, umLabeller assigns one of four categories: _vocab, alien, morph, or n/a_:
+Given a word _w_ and its subword tokenization, _s_ = (_s_<sub>1</sub>, ..., _s_<sub>n</sub>) | ∀i _s_<sub>i</sub> ∈ V, umLabeller assigns one of four categories: _vocab, alien, morph, or n/a_:
 
 - **vocabulary subword**: the given word _w_ is a subword in the vocabulary as _w_ ∈ _V_;
-- **alien composition**: the given subword sequence _s_ is an alien subword composition if we find at least two subwords _si_ and _sj_ in s that are not meaningful with respect to the meaning of _w_;
+- **alien composition**: the given subword sequence _s_ is an alien subword composition if we find at least two subwords _s_<sub>i</sub> and _s_<sub>j</sub> in s that are not meaningful with respect to the meaning of _w_;
 - **morphological composition**: the subword sequence _s_ is morphological if it is neither a vocabulary nor an alien subword composition;
 - **n/a**: UniMorph has no information on the word.