$\begin {array} {1 1} (A)\;Amphimixis & \quad (B)\;Disappearance \: of \: macronucleus \\ (C)\;Attachments \: of \: the \: conjugants & \quad (D)\;Post\: conjugation\: fissions \\ (E)\: Prezygotic\: nuclear\: divisions & \quad (F)\: Postzygotic\: nuclear\: divisions \end {array}$
$\begin {array} {1 1} (1)\;C \rightarrow B \rightarrow A \rightarrow E \rightarrow D \rightarrow F & \quad (2)\;C \rightarrow B \rightarrow E \rightarrow A \rightarrow F \rightarrow D \\ (3)\;F \rightarrow A \rightarrow D \rightarrow B \rightarrow C \rightarrow E & \quad (4)\;F \rightarrow D \rightarrow A \rightarrow E \rightarrow B \rightarrow C \end {array}$
