6.1.101-akaHa savarNNe dIrghaHa

6.1.101 akaHa savarNNe dIrghaHa
...............

When a word-final 'a' or 'A' is followed by 'a' or 'A' replace them with a single 'A'.
When a word-final 'i' or 'I' is followed by 'i' or 'I' replace them with a single 'I'.
When a word-final 'u' or 'U' is followed by 'u' or 'U' replace them with a single 'U'.
When a word-final 'Ru' or 'Ri' is followed by 'Ru' or 'Ri' replace them with a single 'Ri'.
When a word-final 'lRu' or 'lRi' is followed by 'lRu' or 'lRi' replace them with a single 'lRi'.

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RULE: akaHa-(ABL-S) savarNNe-(LOC-S) dIrghaHa-(NOM-S) ... + [achi-(LOC-S) {6.1.77} ekaHa-(NOM-S) {6.1.84}]

[ 'ak' _ 'ach' combination is replaced by their 'dIrgha' (prolated) form, if the 'ach' is a 'savarNNa' ('similar' letter i.e. with the same 'place of origin' and 'effort' i.e. see the sutra {1.1.9: tulyAsyaprayatnaM savarNNam} ) ]

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The following illustrations show the derivation of some of the examples below:
BG 1.11

bhISHmamevAbhirakSHantu ⇐{6.1.101}
bhISHmameva abhirakSHantu

BG 1.30

bhramatIva ⇐{6.1.101}
bhramati iva

BG 1.11
Underlying: ayaneSHu cha sarveSHu yathAbhAgam avasthitAs , bhISHmam eva abhirakSHantu bhavantas sarve eva hi .

bhISHmamevAbhirakSHantu

BG 1.17
Underlying: kAshyas cha parameSHvAsas shikhaNNDI cha mahArathas , dhRuSHTadyumnas virATas cha sAtyakis cha aparAjitas .

chAparAjitaHa

BG 1.26+27
Underlying: tatra apashyat sthitAn pArthas pitRin atha pitAmahAn , AchAryAn mAtulAn bhrAtRin putrAn pOtrAn sakhIn tathA shvashurAn suhRudas cha eva senayos ubhayos api .

tatrApashyatsthitAnpArthaHa

BG 1.30
Underlying: gANNDIvam sraNsate hastAt tvak cha eva paridahyate , na cha shaknomi avasthAtum bhramati iva cha me manas .

bhramatIva

BG 1.44
Underlying: utsannakuladharmANNAm manuSHyANNAm janArdana , narake aniyatam vAsas bhavati iti anushushruma .

bhavatItyanushushruma

BG 2.5
Underlying: gurUn ahatvA hi mahAnubhAvAn shreyas bhoktum bhEkSHyam api iha loke , hatvA arthakAmAn tu gurUn iha eva , bhuNjIya bhogAn rudhirapradigdhAn .

hatvArthakAmANstu
bhEkSHyamapIha

BG 2.8
Underlying: na hi prapashyAmi mama apanudyAt yat shokam uchchhoSHaNNam indriyANNAm , avApya bhUmO asapatnam Ruddham , rAjyam surANNAm api cha Adhipatyam .

chAdhipatyam
mamApanudyAdyat

BG 2.11
Underlying: shrI bhagavAn uvAcha . ashochyAn anvashochas tvam prajnyAvAdAn cha bhASHase , gatAsUn agatAsUn cha na anushochanti paNNDitAs .

nAnushochanti

BG 2.12
Underlying: na tu eva aham jAtu na Asam na tvam na ime janAdhipAs , na cha eva na bhaviSHyAmas sarve vayam atas param .

nAsam
tvevAham

BG 2.16
Underlying: na asatas vidyate bhAvas na abhAvas vidyate satas , ubhayos api dRuSHTas antas tu anayos tattvadarshibhis .

nAsato
nAbhAvo

BG 2.17
Underlying: avinAshi tu tat viddhi yena sarvam idam tatam , vinAsham avyayasya asya na kashchit kartum arhati .

vinAshamavyayasyAsya

BG 2.19
Underlying: yas enam vetti hantAram yas cha enam manyate hatam , ubhO tO na vijAnItas na ayam hanti na hanyate .

nAyam

BG 2.21
Underlying: veda avinAshinam nityam yas enam ajam avyayam , katham sas puruSHas pArtha kam ghAtayati hanti kam .

vedAvinAshinam

BG 2.25
Underlying: avyaktas ayam achintyas ayam avikAryas ayam uchyate , tasmAt evam viditvA enam na anushochitum arhasi .

nAnushochitumarhasi

BG 2.29
Underlying: Ashcharyavat pashyati kashchit enam Ashcharyavat vadati tathA eva cha anyas , Ashcharyavat cha enam anyas shRuNNoti shrutvA api enam veda na cha eva kashchit .

chAnyaHa
shrutvApyenam

BG 2.31
Underlying: svadharmam api cha avekSHya na vikampitum arhasi , dharmyAt hi yuddhAt shreyas anyat kSHatriyasya na vidyate .

chAvekSHya

BG 2.34
Underlying: akIrtim cha api bhUtAni kathayiSHyanti te avyayAm , sambhAvitasya cha akIrtis maraNNAt atirichyate .

chApi

BG 2.36
Underlying: avAchyavAdAn cha bahUn vadiSHyanti tava ahitAs , nindantas tava sAmarthyam tatas duHakhataram nu kim .

tavAhitAHa

BG 2.40
Underlying: na iha abhikramanAshas asti pratyavAyas na vidyate , svalpam api asya dharmasya trAyate mahatas bhayAt .

nehAbhikramanAshoBsti

BG 2.42
Underlying: yAm imAm puSHpitAm vAcham pravadanti avipashchitas , vedavAdaratAs pArtha na anyat asti iti vAdinas .

nAnyadastIti

BG 2.44
Underlying: bhogEshvaryaprasaktAnAm tayA apahRutachetasAm , vyavasAyAtmikA buddhis samAdhO na vidhIyate .

tayApahRutachetasAm

BG 2.45
Underlying: trEguNNyaviSHayAs vedAs nistrEguNNyas bhava arjuna , nirdvandvas nityasattvasthas niryogakSHemas AtmavAn .

bhavArjuna

BG 2.50
Underlying: buddhiyuktas jahAti iha ubhe sukRutaduSHkRute , tasmAt yogAya yujyasva yogas karmasu kOshalam .

jahAtIha

BG 2.55
Underlying: shrI bhagavAn uvAcha . prajahAti yadA kAmAn sarvAn pArtha manogatAn , Atmani eva AtmanA tuSHTas sthitaprajnyas tadA uchyate .

AtmanyevAtmanA

BG 2.57
Underlying: yas sarvatra anabhisnehas tat tat prApya shubhAshubham , na abhinandati na dveSHTi tasya prajnyA pratiSHThitA .

nAbhinandati

BG 2.58
Underlying: yadA saNharate cha ayam kUrmas aNgAni iva sarvashas , indriyANNi indriyArthebhyas tasya prajnyA pratiSHThitA .

chAyam
aNgAnIva
indriyANNIndriyArthebhyaHa

BG 2.62
Underlying: dhyAyatas viSHayAn puNsas saNgas teSHu upajAyate , saNgAt saNjAyate kAmas kAmAt krodhas abhijAyate .

teSHUpajAyate

BG 2.66
Underlying: na asti buddhis ayuktasya na cha ayuktasya bhAvanA , na cha abhAvayatas shAntis ashAntasya kutas sukham .

nAsti
chAyuktasya
chAbhAvayataHa