spaCy/spacy/lang/nl/lemmatizer/_adpositions_irreg.py

# coding: utf8
from __future__ import unicode_literals


ADPOSITIONS_IRREG = {
    "'t": ('te',),
    'me': ('mee',),
    'meer': ('mee',),
    'on': ('om',),
    'ten': ('te',),
    'ter': ('te',)
}