@line
@(cases)
@  line
@  (output)
second line is the same as first line
@  (end)
@(or)
@  (skip)@line
@  (output)
first line is a suffix of the second line
@  (end)
@(or)
@  line@(skip)
@  (output)
first line is a suffix of the second line
@  (end)
@(or)
@  prefix@line@(skip)
@  (output)
first line is embedded in the second line at position @(length prefix)
@  (end)
@(or)
@  (output)
first line is not found in the second line
@  (end)
@(end)