### Dividing lines

Sorry folks, a basic question for most of you, but what does it mean when a tune is divided by lines and double lines like so:

dAF E3 DB,A, D2 E | FGF BAF dAF EFA |

dAF E3 DB,A, D2 E |1 F3 BAF EDC D :|

2 F3 BAF EDC D3 ||

|: d3 f3 a2 f edB | A2 F DFA BAF EFA |

dcd fef a2 f edB |1 A2 F DFA Bdc d3 :|

2 A2 F DFA B/c/dc d ||

Is this part of the whole first part twice and second part twice?

Cheers