Isomer of octane and hexan?

Question

which are Isomers of octane and hexan? If any interner source about isomers ,please tell me,

Answer 1

Sorry my bprevious answer was wrong.

Isomeres of hexane:

Hexane
C-C-C-C-C-C

2-methyle-pentane
C-C-C-C-C
....|
....C

3-methyle-pentane
C-C-C-C-C
........|
......C

2,2-dimethyle-buthane
...C
....|
C-C-C-C-C
....|
...C

2,3-dimethyle-buthane
...C
....|
C-C-C-C-C
........|
.......C