Maltose contains how many oxygen atoms
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R\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\, \\
{{H}_{2}}N-CH-COOH \\
\end{matrix}$ If $R = -CH_2C_6H_5$ then it is phenylalanine $(Phe)$ and if $R = CH_3$ then it is alanine $(Ala)$. Find the sequence of reagents from those given below to synthesize $Phe- Ala$$(1)$ $\begin{matrix}
C{{H}_{3}} \\
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ZNH\,C\,HC{{O}_{2}}H \\
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C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
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\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}{{C}_{6}}{{H}_{5}} \\
|\,\,\,\,\, \\
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C{{H}_{2}}{{C}_{6}}{{H}_{5}}\,\,\,\,\, \\
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$\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{x\,eq.of}}$ acetyl derivative
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$' x ^{\prime},{ }^{\prime} y ^{\prime}$ and ${ }^{\prime} z^{\prime}$ in these reactions are respectively.