deriv SD cv (1296) ashtadhyayi.com hei.de L 1296 ETT STT a 5.3.15 ALPH OLDHOMEPAGE NEWHOMEPAGE

sarvaikAnya;kiM;yat;tadaH kAle dA

सर्वैकान्यॱकिंॱयत्तदः काले दा ONPANINI 53015

/dA means time after /sarva-, /eka-, /anya-, /kim-, /yad-, /tad-.

Only examples:

/sarva- + /dA → **sarvadA सर्वदा "always" (at all times)

ekadA एकदा "once" (at one time)
anyadA अन्यदा "elsewhen" ("at another time")
kadA कदा "when?" (at what time?)
yadA यदा "whenever" (the time at which)

/tad- + /dA → **ta- तॱ + /dA → !**tadA तदा "then" (at that time)

This sUtra might as well have been phrased sarvakimekayadanyatadaHkAledA सर्वकिमेकयदन्यतदःकालेदा. /pANini is trying to make as many vowel merges as possible. See panini's razor.