Gaelic Alphabet 'S'

We have been talking about some of the strong characters in the Gaelic alphabet and S is another one of these. Though not as strong a lenition resister S will resist lenition is some cases and she is often grouped with T and D. She also will not lenite when she is hanging out with G,P,T (sg,sp,st). When she does lenite she makes a H sound. When combined with the definite article an t- her sound will be overridden by T and he will be broad or slender in relation to the vowel on the other side of the S. When broad she makes the normal S sound and when slender she makes the SH sound.  
​There is also a tendency in Gaelic to do pairs of words with opposite meanings where the words sound the same but one starts with S and the other with D.
​for example: saor=free/inexpensive  daor=expensive