Recoupling - Futility Closet

From reader Dave Lawrence: What is notable about these 14 sets of words?

accost commit launch deeded
adhere heckle silent versed
ampere arrive angers theses
chance ascent tester stored
chaste ascend tinder seeded
cohere heckle silent versed
debase mucked refile stress
demure riffle silent versed
endure shelve riling nested
forego recess gossip needed
herein advice resins stones
rebate locket career tested
recast costar pirate esters
remade astute surest rested

	Select Click for Answer
If each six-letter word is divided into three pairs of letters, then combining the corresponding pairs within each row will produce three new eight-letter words: ACcoST COmmIT LAunCH DEedED –> ACCOLADE communed STITCHED Similarly, Dave has been uncovering pairs of 10-letter words that can be recombined to form 5 sets of 4-letter words: calamitous newscaster : cane laws mica tost user individual challenges : inch dial vile dung ales locomotive investment : loin cove most time vent malodorous threesomes : math lore does room uses recuperate intestines : rein cute pest rain tees (Thanks, Dave.)

Click for Answer

If each six-letter word is divided into three pairs of letters, then combining the corresponding pairs within each row will produce three new eight-letter words:

ACcoST COmmIT LAunCH DEedED –> ACCOLADE communed STITCHED

Similarly, Dave has been uncovering pairs of 10-letter words that can be recombined to form 5 sets of 4-letter words:

calamitous newscaster : cane laws mica tost user
individual challenges : inch dial vile dung ales
locomotive investment : loin cove most time vent
malodorous threesomes : math lore does room uses
recuperate intestines : rein cute pest rain tees

(Thanks, Dave.)