Question: Determine the sound changes that took place in the development of Marathi from Old Indic. Classify the sound changes as conditioned or unconditioned. Then specify what type of sound change each one is. [c] is a voiceless palatal stop, [?] a voiceless retroflex stop, and [?] a voiced retroflex stop. 

Old Indic Marathi Gloss

[a?ka] [a?ka] 'hook'

[arka] [akka] 'sun'

[b?akti] [b?atti] 'devotion'

[catwa?ri] [catta?ri] 'four'

[kalpa] [kappa] 'rule''rule'

[kardama]     [kaddama]   'mud'

[mudgara] [muggara] 'mallet'

[pita?] [pia?] 'father'

[rudra] [rudda] 'terrible'

[sapatni?] [savatti?] 'co-wife'

[supta] [sutta] 'asleep'

[?abda] [sadda] 'sound'

[?ata] [sa?] 'hundred'

[vikrama] [vikkama] 'strength'