
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Among the following propositions:  
\\(①\\) Given \\(ab \neq 0\\), if \\(a-b=1\\), then \\(a^{3}-b^{3}-ab-a^{2}-b^{2}=0\\);  
\\(②\\) If the function \\(f(x)=(x-a)(x+2)\\) is an even function, then the value of the real number \\(a\\) is \\(-2\\);  
\\(③\\) For two points \\(P\\), \\(Q\\) on the circle \\(x^{2}+y^{2}-2x=0\\) that are symmetric about the line \\(kx-y+2=0\\), then \\(k=2\\);  
\\(④\\) When choosing any \\(2\\) numbers from \\(1\\), \\(2\\), \\(3\\), \\(4\\), \\(5\\), \\(6\\), the probability of selecting two consecutive natural numbers is \\(\dfrac{1}{2}\\).  
The true propositions are __________ (Fill in the sequence numbers of all true propositions).

Present the answer in LaTex format: \boxed{Your answer}
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