4th vowel U -gudideerghamu.

gaDa,

 guDideerghamu E -4th vowel

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 as guDideerghamu the fourth vowel I ఈ  changes its form suitable to the consonant co-ordination.Mostly it is visible to majority letters except ya and for ma it will be seen in both ways .

 let us observe some words where this vowel comes as it is .

Iga,Ita,Ika,Ila,ISa,Ime,......

 ఈగ,ఈత,ఈక,ఈల,ఈశ,ఈమె,..

....  

 ఈగ,ఈత,ఈక,ఈల,prathamaakshara padamulu

 meegaDa,teeramu,cheekaTi,neelamu,deepamu,.......

  మీగడ,తీరము,చీకటి,నీలము,దీపము,.......