echo --split a,b,,c,,,d,,,,e,,,,,f,,,,,,e
echo --split ,a,b,,c,,,d,,,,e,,,,,f,,,,,,e,
echo --split ,,a,b,,c,,,d,,,,e,,,,,f,,,,,,e,,
echo --split ,,,a,b,,c,,,d,,,,e,,,,,f,,,,,,e,,,
echo --split ,,,,a,b,,c,,,d,,,,e,,,,,f,,,,,,e,,,,