Table:
0
A
B
C
D
E
1
Winner
Country
Winter Olympics
FIS Nordic World Ski Championships
Holmenkollen
2
Hallgeir Brenden
Norway
1956
1956
1956
3
Eero Mäntyranta
Finland
1964
1964
1962, 1964, 1968
4
Harald Grønningen
Norway
1968
1968
1960, 1961
5
Thomas Wassberg
Sweden
1980
1980
1979, 1985
6
Gunde Svan
Sweden
1984
1989
1985

Questions and formulas:
Question: What is the FIS Nordic World Ski Championship years when the winter Olympics took place in 1968?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1=1968),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6=1968),4))
Level: medium
Question: Which country has a FIS Nordic World Ski Championship before 1989, was in the winter Olympics before 1980, and has a Holmenkollen of 1956?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1<1989)*(C1<1980)*(E1=1956)),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(D2:D6<1989)*(C2:C6<1980)*(E2:E6=1956)),2))
Level: medium