Words to Describe trigrams

How trigrams often is described ("________ trigrams")

• upper
• nuclear
• chinese
• light
• auditory
• subsidiary
• original
• value
• similar
• grammatical
• letter
• hsi
• called
• lower
• variegated
• primary
• famous
• component
• derived
• outer
• unpronounceable
• pronounceable
• mystic
• corresponding
• meaningless
• consonant
• initial
• low
• basic
• respective
• meaningful
• cardinal
• simpler
• frequent
• separate
• ponent
• possible
• inner
• fundamental
• pure
• different
• positional
• dissimilar
• unseen
• dark
• ancient