What is $^{y(slog_xa)}x$?

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What is $^{y(slog_xa)}x$ ?

In this website about tetration, it's shown that $^{y+slog_xa}x=$ $^{y}x^a$, as $^{1+slog_xa}x=x^a$.

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So what is $^{y(slog_xa)}x$ ? Is it $^{y}a$ ?