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Collapse-O/Pro-Matic Highlander Must Be One

As of Collapse-O-Matic version 1.7.2 and Collapse-Pro-Matic version 1.3.2 we have added the ability to force one element to stay open in a highlander grouping. Simply add the class must-be-one to all the triggers in a highlander group using the trigclass attribute like so:

Shortcode

[expand title="Monkeys" rel="animal-highlander" trigclass="must-be-one"]...[/expand]
[expand title="Donkeys" rel="animal-highlander" trigclass="must-be-one"]...[/expand]
[expand title="Ninjas" rel="animal-highlander" trigclass="must-be-one"]...[/expand]

Example

Monkeys
A monkey is a primate of the Haplorrhini suborder and simian infraorder, either an Old World monkey or a New World monkey, but excluding apes and humans. There are about 260 known living species of monkey. Many are arboreal, although there are species that live primarily on the ground, such as baboons. Monkeys are generally considered to be intelligent. Unlike apes, monkeys usually have tails. Tailless monkeys may be called “apes”, incorrectly according to modern usage; thus the tailless Barbary macaque is called the “Barbary ape”.
Donkeys
The donkey or ass, Equus africanus asinus,[1][2] is a domesticated member of the Equidae or horse family. The wild ancestor of the donkey is the African wild ass, E. africanus. The donkey has been used as a working animal for at least 5000 years. There are more than 40 million donkeys in the world, mostly in underdeveloped countries, where they are used principally as draught or pack animals. Working donkeys are often associated with those living at or below subsistence levels. Small numbers of donkeys are kept for breeding or as pets in developed countries.
Ninjas
A ninja (忍者?) or shinobi (忍び?) was a covert agent or mercenary in feudal Japan who specialized in unorthodox warfare. The functions of the ninja included espionage, sabotage, infiltration, and assassination, and open combat in certain situations.[1] Their covert methods of waging war contrasted the ninja with the samurai, who observed strict rules about honor and combat.[2] The shinobi proper, a specially trained group of spies and mercenaries, appeared in the Sengoku or “warring states” period, in the 15th century,[3] but antecedents may have existed in the 14th century,[4] and possibly even in the 12th century (Heian or early Kamakura era).[5][6]