
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
Given four functions: $①y=-x$, $②y=- \frac{1}{x}$, $③y=x^{3}$, $④y=x^{ \frac{1}{2}}$, determine the probability of the event "the graphs of the two selected functions have exactly one common point" when two functions are selected from these four.

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