Could I say:

dearmad tréis dearmaid

or


dearmad tréis dearmad


Given there is a complex preposition, but it is being used in a 'serial sentance' it confuses me

Thanks.

PS -I read it nowhere, but generated it myself when writing

Sounds a bit "calquey". ;-)

De Bhaldraithe has:

duine i ndiaidh an duine eile "one after the other"
ceann i ndiaidh an chinn eile "one after the other"
arís is arís eile "time after time; time and time again"

Makes me think you need eile in there somewhere:

dearmad tar éis dearmaid eile (?)

Or use tar éis a chéile:

dearmaid, ceann tar éis a chéile

Just some ideas. Probably still "calquey", though. :-(

And the making of calques in ones own Irish has opened my eyes -long have I decried the rise/spread of 'Dublin Irish' not out of a sense of linguistic purity, but that they were being deliberately recalcitrant, or arrogant, or even racist, but now I see one big thing -people need to express themselves, and some people just don't care where the expression comes from, calque or no calque.

In such 'serial sentances' I feel Irish does not have many 'long range' grammatical agreements, that is, if we look at these examples:

measa sa mheasa (worse and worse)
níos fearr agus níos fearr aríst (better and better again)

there is no extra agreements needed (like the second 'fearr' changing because of the first), it is just a chain.
That is why 'dearmad tréis dearmaid' seemed so wrong to me.

Maybe: 'dearmad i ndiaidh (an) dearmaid' but then what to do with the definite article?

Rinne mé dearmad i ndiaidh a chéile. = I made mistake after mistake.

That's sounds more like it, Dennis!

Go rabh maith'ad!