dogs, sled, food
I'm not sure what you mean by 'mandatory' symbol. The crucifix is called a sacramental; it is an item that is supposed to help Catholics focus on some aspect of spirituality. There are no devotions to any of these things (sacramentals) that are 'mandatory' to membership in good standing.
It is a good to know item. It is not mandatory or necessary. Basic knowledge of core Java is enough to learn JSP and Servlets.
Three dimensions
art
A tripod and a milking stool, both have three legs.
The current Supply of item, Demand for the item, and Value of the currency used to purchase it.
Tracking numbers aren't mandatory, but there are still delivery estimates.
fur
<ul> <li>Item One</li> <li>Item Two</li> <li>Item Three</li> </ul>
Water is the only item found on earth in three different phases of matter at standard pressure.
Mandatory means must have or required and is a required item to apply to the job. If you don't have that skill, don't even bother applying for that job. So make sure you have that skill and it is listed on your resume. For example, Knowledge of MS Office and Internet. It means candidate must have knowledge of MS Office and Internet
His three note books.