Example building empty lm:
Lm mylm vocab empty 0.6 -penalty 0.1 -zerogram 99.9 -emptyfilename test.nist

Example building lm from a list of hypotheses:
Lm mylm vocab hypolistobj 0.6 -penalty 0.1 -zerogram 99.9 -customfilename test.nist

vocab            vocabulary this lm is defined over",
method           nistfilename | hypolistobj | empty",
weight           language model weight (multiplicative)",
-penalty         language model offset (additive)",
-zerogram        language model penalty for words that are in vocab but not in lm
-customfilename  filename if building form hypos (default is custom.nist)
-emptyfilename   filename if using method empty (default is empty.nist)
-cachelines      number of cache lines

 puts        write out info about lm in tcl-format
 score       get language model scores (only on active Lm)
 debug       show internal data structures 
 activate    make this lm the current one
 cachelines  change number of cachelines

-name
-useN
-vocab
-weight
-penalty
-zerogram