
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
If for any point $M(x,y)$ on the curve $y=f(x)$, a tangent line $L$ can be drawn at $M$, and there always exists another point $N(x_{1},y_{1})$ on the curve, different from $M$, such that a tangent line $L_{1}$ can be drawn at $N$ and $L \parallel L_{1}$, then the curve $y=f(x)$ is said to have "parallelizability". Among the following four curves:  
1. $y=x^{3}-x$  
2. $y=x+ \dfrac {1}{x}$  
3. $y=\sin x$  
4. $y=(x-2)^{2}+\ln x$  

The curves that have parallelizability are __________. (Write down all the curve numbers that satisfy the condition.)

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