insert one dash where needed.\nmount rainiers liberty ridge climbing\nroute is known for its amazing views…

insert one dash where needed.\nmount rainiers liberty ridge climbing\nroute is known for its amazing views and\ntechnical difficulty not to mention its long\nhistory of mountaineering accidents.

insert one dash where needed.\nmount rainiers liberty ridge climbing\nroute is known for its amazing views and\ntechnical difficulty not to mention its long\nhistory of mountaineering accidents.

Answer

Explanation:

Step1: Identify the break point

The phrase "not to mention" introduces an additional comment, so a dash should be placed before it to set off the additional information.

Step2: Insert the dash

Place the dash after "technical difficulty" to separate the main clause from the additional comment.

Answer:

Mount Rainier's Liberty Ridge climbing route is known for its amazing views and technical difficulty — not to mention its long history of mountaineering accidents.