This format is represented as a two-column file where each line contains a source state followed by its corresponding target state, in the synchronouns dynamics. The first line of the table can have a non-mandatory list of node identifiers to be used. This file can be incomplete i.e., can lack information regarding some of the source states of the corresponding state transition graph.
See http://doc.ginsim.org/format-truthtable.html
Example:
GeneA GeneB GeneC 000 100 001 010 # This is a comment 010 110 011 110 100 100 # Yet another unnecessary comment 101 000 110 110 111 110