sa sparán in the purse

sa is a word made up of the preposition "i" in and the definite article "an" the

Of all the prepositions in Irish this one needs to be learnt well. On its own it eclipses some consonants (see urú) and it has different forms before vowels and consonants. The following table gives the various forms:

So now you know when to use: i, in, sa, san, and sna !