Remapping TAB + SPACE to some key

[luftaquila]

I'm using CTRL+SPACE and SHIFT+SPACE to change my language input:

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<^Space::VK15
<+Space::VK15

And now I want to remap TAB + SPACE to do the same thing. But none of the below works properly.

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TabSpace::VK15
{Tab}{Space}::VK15

What should I do to remap TAB + SPACE?
Thank you for your help.

[Rohwedder]

Hallo,
try:

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Tab & Space::VK15

but the prefix key Tab will loses its native function.

[luftaquila]

Hallo,
try:

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Tab & Space::VK15

but the prefix key Tab will loses its native function.

Thank you for your reply. What I want was maintaining Tab key function while assign Tab & Space to VK15. Thank you.

[Rohwedder]

Then perhaps:

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~Tab & Space::VK15

Tab remains Tab even if Space is pressed additionally.

[mikeyww]

A different sort of effect:

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Tab::Tab
Tab & Space::x

Explained: Custom combinations