Yes, you can enter the U4 in Vienna at the age of 16. There are no age restrictions for using public transportation in Vienna, including the U-Bahn (subway) system. As long as you have a valid ticket or pass, you can access and use the U4 line or any other public transportation in the city. **

The upper sum of o4 and u4 is 12, while the lower sum is 8. The upper sum is calculated by adding the largest value of each pair of numbers, while the lower sum is calculated by adding the smallest value of each pair of numbers. In this case, the pairs are (3, 4), (4, 4), (5, 4), and (6, 4). **

To get from Frankfurt Central Station to the U4 subway line, you will need to first walk to the nearby Willy-Brandt-Platz station. From there, you can take the U1, U2, U3, or U8 subway lines to the Hauptwache station. At Hauptwache, you can transfer to the U4 line which will take you to your desired destination. Be sure to check the schedule and platform information for the U4 line to ensure a smooth transfer. **

To find the total sum of u, we need to add up all the individual values of u from u1 to u48. This can be calculated by adding u1 + u2 + u3 + ... + u48. The total sum of u would be the sum of all these individual values. **

You are looking for the song "Ale Ale Ale" by Ricky Martin. This song is from his album "A Medio Vivir" and it is a lively and upbeat Latin pop song that features the repeated chant of "Ale Ale Ale" throughout the chorus. It was a popular hit for Ricky Martin and is known for its catchy and energetic rhythm. **

A pint is a unit of volume measurement commonly used to measure liquids. In the United States, a pint is equal to 16 fluid ounces, while in the United Kingdom, it is equal to 20 fluid ounces. Pints are often used to measure beverages such as beer, milk, and water, and are also used as a serving size in bars and restaurants. **

Ginger ale is a carbonated soft drink flavored with ginger. It is typically sweetened and can be enjoyed on its own or used as a mixer in cocktails. Ginger ale has a distinct ginger flavor and is known for its refreshing and slightly spicy taste. It is a popular beverage choice for those looking for a non-alcoholic option with a unique flavor profile. **

"Ale" is a type of alcoholic beverage that is brewed using malted barley and flavored with hops. It is typically fermented at warmer temperatures than lager, resulting in a more complex and fruity flavor profile. Ales can vary widely in color, flavor, and strength, and include styles such as pale ale, India pale ale (IPA), stout, and porter. **