1) Available actions:

• Clear: 

  Removes all elements from the Stack.

• Contains: 

  Determines whether an element is in the Stack.

• Count: 

  Gets the number of elements contained in the Stack.

• Peek: 

  Returns the object at the top of the Stack without removing it.

• Pop:

  Removes and returns the object at the top of the Stack.

• Push: 

  Inserts an object at the top of the Stack.