AD
----------------------------------------------------
 B       C     C    D     --soft   B       C     D
                          --mixed  B       D     D
                          --hard   D       D     D
                          --merge (disallowed)
                          --keep  (disallowed)</pre>
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</div>
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<div class="content">
<pre>working index HEAD target         working index HEAD
----------------------------------------------------
 B       C     C    C     --s