Merpy ignoring strings from lexicon

[SIRConceicao]

Hello,

I have found a bug that ignores specific strings from the input lexicon.

In this case the strings that I detected are "A2M" and "A1BG".

The code that I used to test this lexicon is the following:

import merpy 

merpy.download_mer()

geneSyn=merpy.create_lexicon_from_file("gene_synonyms_lexicon.txt", "geneSyn")
merpy.process_lexicon("geneSyn")

#Examples
print(merpy.get_entities("The genes encoding myeloperoxidase (MPO) and alpha(2)-macroglobulin (A2M)", "geneSyn"))

print(merpy.get_entities("The association between polymorphisms in the alpha-2-macroglobulin (a2m) gene", "geneSyn"))

print(merpy.get_entities("The gene A2M with A1BG and NAT1 are", "geneSyn"))

print(merpy.get_entities("fragment of A1BG in urine in SRNS", "geneSyn"))

The file in use:
gene_synonyms_lexicon.txt