The Geographical Dictionary of Ancient and Mediaeval India c3.s2.t2.12

c3.s2.t2.12

CHANGE OF COMPOUND LETTERS.
(c) chchh=chh as Kachchha Kachh Machchherî, Machherî kt=tth, as Suktimatî, Sotthivatî ksh=(1) kh, as Kshûagrîma, Khuragrama Lakshmanîvatî, Lakhnautî
(2) khh, as Dakshina, Dakhhina (Dekhan)
(3) ch, as Baloksha, Beluchistân
(4) chchh, as the affix Kshetra, Chehchhatra, Ahuchchhatra
(5) chh, as the affix Kshetra, Chhatra, Ahichhetra, Ahichhatra tt=t, as Mârttanda, Matan ts or tsy=(1) chchh } as Matsyadesa, Machchherî Machherî
(2) chh dy=(1) j, as Vidyânagara, Bijanagar
(2) jj, as Udyânaka, Ujjânaka dhy=jjh, as Madhyadesa, Majjhimadesa st=(1) t, as Suvâstu, Swaṭ [see II, (7), I, (9)]
(2) tth, as Srâvastî, Sâvatthi sm=sv, as Aśmaka, Asvaka sv=ss (by assimilation), as Asvaka, Assaka