What two common data structures were included in Plankalkl?

In what year was Plankalkl designed? In what year was that design
published?

2. What two common data structures were included in Plankalkl?

3. How were the pseudocodes of the early 1950s implemented?

4. Speedcoding was invented to overcome two significant shortcomings of
the computer hardware of the early 1950s. What were they?

5. Why was the slowness of interpretation of programs acceptable in the
early 1950s?