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I was playing an online treasure hunt and came across a question with image.

http://i.imgur.com/lojD1.png

clues
1.its a 4 letter word
2.two letters are 'R' and 'S' (S from star)
3.Think Science and technology

Wild guess - RADS ? xray dose measurement

Got one more clue

Pattern is

_ R _ S
S is last and R is adjacent to it.

another wild guess ! Ergs ? - units of energy

tried that too. :(

you too play www.cetdhwani.com/treasure

Thanks but no thanks - I will stick to crosswords ! - Happy New Year

how about Iris - the coloured part of the eye?

You've probably already tried these, but...
ARCS(mathematics/electricity)
IRIS (as in lenses)

the master got it wrong.
he first gave clue as

_R_S
now he changed it to

_ _ RS
so i git the answer.
thanks for all yours help

err... so what's the answer? MIght help us to help you on the other question.