One method of solving puzzles like this
involves setting up a grid
representing all possible relation
s between the variable
s in the problem, and filling it in with X's for impossible
relations or O's for certain
ones (or ?'s for unknown
relations in this example, though you'd ordinarily use blank
cells), and using it to assist in solving by process of elimination
The grid for this problem might look like this:
b f e
Smith ? ? ?
Jones ? ? ?
Robinson ? ? ?
Note that some other information, like the passengers, incomes, and homes are not included. These are merely window dressing, though this puzzle has more than most.
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