Modifiers matching difficulty:

• typical,
• psychological,
• emotional,
• nutritional,
• logistical,
• secondary,
• domestic,
• personal,
• physical,
• traditional,
• serious,
• reproductive,
• extreme,
• maternal,
• mechanical,
• particular,
• operational,
• practical,
• acute,
• leaning,
• neuropsychiatric,
• respiratory,
• related,
• behavioural,
• psychiatric,
• home,
• neurological,
• experimental,
• financial,
• significant,
• real,
• single,
• interpersonal,
• linguistic,
• common,
• motor,
• experienced,
• mathematical,
• periodic,
• surgical,
• clinical,
• computational,
• sexual,
• major,
• spiritual,
• technical,
• minor,
• temporary,
• local,
• important,
• somatic,
• anatomical,
• possible,
• smaller,
• subjective,
• unusual,
• extra,
• economic,
• regulation,
• environmental,
• invisible,
• visual,
• basic,
• extraneous,
• technological,
• mental,
• functional,
• unforeseen,
• chronic,
• internal,
• structural,
• academic,
• ongoing,
• concurrent,
• sensory,
• educational,
• external,
• commercial,
• parental,
• unexpected,
• severe,
• legal,
• stable,
• conceptual,
• cognitive,
• natural,
• past,
• special,
• behavioral,
• prevalent,
• social,
• perceptual,
• hormonal,
• unanticipated,
• developmental,
• everyday,
• stressful,
• administrative,
• progressive,
• persistent,
• habitual,
• underlying,

Simple categories matching extraneous:

• matter,
• constituent,
• atmosphere,
• material,
• organism,
• information,
• details,
• software,
• interference,
• equipment,
• sound,
• substance,
• cause,
• item,
• metal,
• constraint,
• part,
• waste,
• tissue,
• compound,
• structure,
• component,
• event,
• thing,
• activity,
• difficulty,
• contaminant,
• cell,
• devices,
• file,
• market,
• device,
• article,
• particle,
• fixture,
• belt,
• symbol,
• force,
• means,
• debris,
• grounds,
• feature,
• influence,
• action,
• stimulus,
• cooling,
• danger,
• variable,
• noisemaker,
• text,
• source,
• agent,
• object,
• factor,
• marking,
• mineral,
• electricity,
• contamination,
• support,
• line,
• detail,
• radiation,
• movement,
• area,
• signal,
• hardware,
• artifact,
• chemical,
• condition,
• antigen,
• light,
• catalyst,
• channel,
• gas,
• noise,
• character,
• fluid,
• dna,
• body,
• stuff,
• solid,