cal_block_energy        Calculation of Item Block "Energy"
cal_block_energy_with_iia
                        Calculation of Item Block "Energy" with IIAs
                        Included
facfun                  Function for Checking If All Items in a Vector
                        Are Unique
get_iia                 Helper Function for Outputting IIA
                        Characteristics of Each Block
make_random_block       Construction of Random Item Blocks
sa_pairing_generalized
                        Automatic Item Pairing Method in Forced-Choice
                        Test Construction
