Consonants can't be placed three in a row. (Unless the first two have the same place, the first is not a stop, and the second is, like "mp" or "nt"
Upthrust. Backstop. Blackstrap (4 in a row!) Axminster (twice, -ksm- and -nst-). Schatzkammer. Opschrijven . All of these violate this proposed rule. Not to mention things like xłp̓x̣ʷłtłpłłskʷc̓, in a language that stretches the very idea of a syllable.
This leads to things like the Japanese word senpai being consistently mispronounced by Japanese speakers as "sempai"
That should be "consistently pronounced." However the native speakers consistently pronounce something is right.
The concept of a consonant has fuzzy edges -- see polymathwannabe's comment. Why is this a problem?
If the data persistently fail to conform to rules abstracted from the data, it is the rules that are wrong).
All of these violate this proposed rule.
After reading some of these comments, there are more exceptions than that, and I wrote it confusingly. So how about this: you cannot have more than one consonant at the same side of a syllable without extenuating circumstances. Having two of them have the same place of articulation (like the s and t in backstop), is a common one. s and z seem to only be possible to place after consonants that are voiced and unvoiced respectively. Neither can be placed after a ʒ (the second half of a j sound).
...That should be "
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