Apologies, it appears I formatted the results as a table, but my formatting did not display correctly on your screen. Allow me to repeat my previous answer, but without the table formatting:

Low caffeine dosage, low alcohol dosage: Caffeine may increase alertness and reduce feelings of drowsiness associated with low levels of alcohol consumption.

Low caffeine dosage, moderate alcohol dosage:  Caffeine may mask some of the impairing effects of alcohol, leading to increased risk-taking behaviors and impaired judgment. The combination can also increase heart rate and blood pressure.

Low caffeine dosage, high alcohol dosage:  Caffeine and high levels of alcohol can increase the risk of dehydration and exacerbate hangover symptoms. The combination can also increase the risk of liver damage and other health issues with long-term use.

Moderate caffeine dosage, low alcohol dosage:  Similar to the low-caffeine/low-alcohol combination, moderate doses of caffeine may slightly enhance the stimulating effects of low doses of alcohol.

Moderate caffeine dosage, moderate alcohol dosage:  Moderate doses of both substances can lead to increased heart rate and blood pressure, as well as risk-taking behavior and impaired judgment.

Moderate caffeine dosage, high alcohol dosage:  The combination of moderate doses of caffeine and high levels of alcohol can exacerbate dehydration and hangover symptoms, as well as increase the risk of liver damage and other health issues with long-term use.

High caffeine dosage, low alcohol dosage:  High doses of caffeine can increase feelings of alertness, but may not fully mask the depressant effects of low doses of alcohol.

High caffeine dosage, moderate alcohol dosage:  High doses of caffeine and moderate levels of alcohol can lead to increased heart rate and blood pressure, as well as risk-taking behavior and impaired judgment.

High caffeine dosage, high alcohol dosage:  The combination of high doses of caffeine and alcohol can greatly increase the risk of dehydration, hangover symptoms, and liver damage with long-term use. The risk of arrhythmias and other health issues is also heightened with this combination.

In summary, high doses of either caffeine or alcohol can be risky on their own, but are even more dangerous when combined. A low of either substance on its own is usually not too dangerous as long as it is consumed safely and responsibly. Don't drive drunk, and definitely don't drive drunk and caffeinated!
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