(Internal) Update groupings record for stimulus
updateCompletedGroupingsRecordForStimulus( groupings_record, selection, o, position )
groupings_record
: a list containing data on completed item sets.selection
: a named list containing data on selected item.o
: a output_Shadow
object.position
: the item position, ranging from 1 to test length.updateCompletedGroupingsRecordForStimulus
returns an updated groupings record.