Single Irish Chain - St. Patrick's Day

17th March is St. Patrick's Day, the patron saint of Ireland.  Patrick lived in the 5th century and was a Roman citizen living in Britain.  March 17th is the anniversary of his death.  More from Wikipedia:

When he was about 16, he was captured from his home in Great Britain and taken as a slave to Ireland, where he lived for six years before escaping and returning to his family. After becoming a cleric, he returned to northern and western Ireland. In later life, he served as an ordained bishop, but little is known about the places where he worked. By the seventh century, he had already come to be revered as the patron saint of Ireland.

Single Irish Chain

It's not hard to choose a block for today - Single Irish Chain, BlockBase 2023. This block is set with alternate plain blocks.