. The child
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The child owes the ska to zat when you said one sound and when two.
The child at your request has to say that separate with vowel, two, going in a row.
You say simple monosyllables one with confluence consonants, others without it for example: cat, mole, current, step, thief, enemy, world, March, etc.
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The child has to tell you, when in the word there are two consonants going in a row and when such sounds are not present.
And now you should return to work on syllabic structure words.