lset<=[procedure] lset<= elt= list1 ...
SRFI-1: Returns true iff every listi is a subset of listi+1,
using elt= for the element-equality procedure. List A is a subset of
list B if every element in A is equal to some element of B.
When performing an element comparison, the elt= procedure's first
argument is an element of A; its second, an element of B.
See also lset=.
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