Need assistance with command parameters.

[Mem5]

Words from a language dictionary?
If yes, I would:
1) extract all words starting from 't' or 'T' => use grep

Code:

# sample wordlist t.dic
tabasco
table

2) Combine these words to produce n-tuples of words (in your case "three or four words long", start with 3, then 4). Optionally, add a space or _ between two words (switch -j/-k);

Code:

# example with 2-words separated with '_'
hashcat -a 1 -j '$_' --stdout t.dic t.dic |  tee t2.dic
tabasco_tabasco
tabasco_table
table_tabasco
table_table

Code:

# example with 3-words separated with '_'
hashcat -a 1 -j '$_' --stdout t.dic t2.dic
tabasco_tabasco_tabasco
tabasco_tabasco_table
tabasco_table_tabasco
tabasco_table_table
table_tabasco_tabasco
table_tabasco_table
table_table_tabasco
table_table_table

3) start hashcat against this new wordlist, straight attack.