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We will then have the following choices considering the criterion of neatness of pattern.

1)
h
s
2)
c
j
s
3)
c
j
ch
s

Of these three, (1) and (3) are more probable since they pattern with the stops which have a set of voiceless, voiced and aspirated phonemes. With no valid reason for prefering one of these two, the first set is arbitrarily chosen for the present analysis. Nevertheless the free variation, especially the four way one, defies a neat description under the structural model.
We shall now analyse the data in the framework of generative phonology. We shall have /c/, /j and /ch/ or /c&/, /j&/ and /c&h/ as the underlying segments on the model of the stops. If we choose the first set, there must be a Palatalisation rule to change the alveolar affricates into their respective palatal affricates. This rule will apply obligatorily before front vowels (thus accounting for the only occurrence of palatals in this environment) and will apply optionally before non-front vowels(thus accounting for the only occurrence of both alveolars and palatals in this environment). This has a theoretical implication. This claims that a phonological rule can be partially optional, i.e., a rule can be optional in certain environments and obligatory in certain other environments. Until we get further proof to validate this claim, this rule can only be provisional.
So we shall take the second set, i.e., the palatal series as the underlying segments. Then there must be an Alveolarization  rule which changes the palatal affricates into their respective alveolar affricates before non-front vowels. This rule will apply optionally. It may be stated as follows:
Alveolarization Rule:

Opt.
[+cons.] [ ] [ ]
Opt. [+high ] ® [ -high ] in
env.__ [+voc. ]
[-back ] [+cor ] [ ]

There must also be a Deocclusion rule in this language which changes the voiceless aspired alveolar and palatal affricates / ch / and / c&h / into / s / and / s& / respectively. This will also be an optional rule and will optional rule and will operate after the alveolarisation rule. It may be stated as follows:
Deocclusion Rule:

[-cont. ] [ ]
[-nasal ]
Opt.
[-abr. rel. ] [ ]
®
[ +cont. ]
[+asp. ]

Let us see now how we get all the surface forms with these two optional rules. When the Alveolarisation rule operates on / /, / / and / h / before non-front vowels, we will get [ c ], [ j ] and [ ch ] respectively before non-front vowels. The optionality of this rule will explain why we have free variation between [ c ] and [ ], [ j ] and [ ] and [ ch ] and [ c&h] before non-front vowels. When the Alveolarisation rule has applied and the Deocuulusion rule applies to its output / ch /, we will get [ s]. When the Alveolarisation rule hasn’t
 

 

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