Do not use fill_n for multiple rows at the same time.
Do not use fill_n for multiple rows at the same time.

Using it makes Windows interator debugging to trigger an assertion.

ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita,ufal/morphodita