make sei more permissive
||Valid:|sei do broda
Invalid|sei do broda do se'u||
sei requires that the last bit be a selbri, making it sort of Subject-Object-Verb. This is odd.
The following choice, added to the start of the free rule in the PEG grammar, seems to fix this:
^SEI-clause free* sentence SEhU-clause^
No significant testing has been done as of yet.