How are runs scored when showing a cribbage hand?

In the card game of cribbage, runs (sequences) are scored during the "showing" phase by identifying every sequence of three or more cards, including the starter card as the fifth card in the hand.1

When calculating your score for runs, keep the following rules in mind:

• Point Value: You receive one point for each card in the sequence.1
• Grouping: Every possible different grouping of cards that forms a sequence counts separately.1
• Constraint: A sequence of four or five cards may be counted only once; it cannot be broken down into multiple separate sequences of three.1

For example, if your hand and the starter card contain a sequence of three cards, you score three points. If you have a sequence of four cards, you score four points.1