and and or evaluate all their arguments in order, similar
to begin, but evaluation stops as soon as one of the expressions
evaluates to false or true, respectively.
Evaluate the exprs from left to right and stop evaluation as soon
as one expression evaluates to #f; the remaining expressions are
not evaluated. The value of the last evaluated expression is returned.
If no expression evaluates to #f, the value of the last
expression is returned.
If used without expressions, #t is returned.
Evaluate the exprs from left to right and stop evaluation as soon
as one expression evaluates to a true value (that is, a value different
from #f); the remaining expressions are not evaluated. The value
of the last evaluated expression is returned. If all expressions
evaluate to #f, #f is returned.
If used without expressions, #f is returned.