Consider the following Rapid Transit Denver (RTD) Light-Rail map (graph), where stations represent vertices and larger ovals indicate stations at which a person can transfer between rail lines (e.g. at the Alameda station it is possible to transfer between the C, D, E, F, or H lines).

Beginning at the Clear Creek station on the G-Line, hence, thus Clear Creek is the root vertex of your tree with children Gold Strike and Pecos Junc., order the stations visited by performing a depth-first graph search using the following traversal criteria:

At each child station, choose the next station by lexical (alphabetical, via ASCII encoding) ordering ignoring case. Remember, numbers come before letters,

Depth-Limit the child branches to a depth of four (note Clear Creek is at depth zero, so you will never be more than four stations away from Clear Creek), and

Do not repeat any previously visited stations (it's a graph search)

Don't forget to start with the root node Clear Creek.

_____	38th & Blake
_____	National Western Center
_____	Olde Town Arvada
_____	Wheat Ridge Ward
_____	Union Station
_____	Gold Strike
_____	Broomfield
_____	30th & Downing
_____	Arvada Ridge
_____	Elitch Gardens
__1__	Clear Creek
_____	Commerce City 72nd
_____	40th & Colorado
_____	Westminster
_____	Mile High Stadium
_____	Church Ranch
_____	Pecos Junc.