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Two groups of words

What's the hidden rule of the two groups?

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1
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    – gabbo1092
    Commented Nov 7, 2018 at 16:17

1 Answer 1

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I'm fairly certain I have the first group right but I'm less sure with the second.

First Group:

Each word has run of 3 letters in alphabetical order. Airstream, Almner, Astute, Deflation, Hijack, Acetaminophen, Laughing.

Second Group:

Each word has a consonant digraph (two letters that spell one sound). Psoriasis, Pushed, Patched, Knifed, Hijack, Acetaminophen, Laughing.

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  • $\begingroup$ I spotted the second but not the first, well done $\endgroup$
    – AHKieran
    Commented Nov 7, 2018 at 16:17
  • $\begingroup$ If so, what about the 'ea' in airstream and the 'ti' in deflation? $\endgroup$
    – kanoo
    Commented Nov 7, 2018 at 17:49
  • $\begingroup$ He said CONSONANT digraph $\endgroup$ Commented Nov 7, 2018 at 17:51
  • $\begingroup$ [insert expletive indicating the realization of my error here] $\endgroup$
    – kanoo
    Commented Nov 7, 2018 at 17:56

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