A.if | B.in case | C.unless | D.since |
A.before | B.once | C.until | D.though |
A.until | B.since | C.unless | D.while |
A.as | B.until | C.although | D.if |
A.Although | B.As long as |
C.If only | D.As soon as |
A.which | B.when | C.so that | D.as if |
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