// 'inputs': object with key = question index and value = text or boolean array
// display: 'all', 'one', 'solution'
// iidx: current level-0 integer index (can match a group of questions / inputs)
// 'inputs': object with key = question index and value = text or boolean array
// display: 'all', 'one', 'solution'
// iidx: current level-0 integer index (can match a group of questions / inputs)