Leads are:
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top of touching honors and interior sequences.
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A from A–K–x-(x…)
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Q from partner either is singleton or promises J
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K from A-K tight or A-K-J-(x)
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Q from A-K-Q-x-(x…) - requests count
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Q from K-Q-T-9 against NT - requests unblocking J
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Top of all doubletons (including honors)
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2nd best from x-x-x-x or x-x-x-x-x (show original 4th best at next opportunity)
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4th best from H-x-x-x or H-x-x-x-x
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Bottom from H-x-x, top from x–x–x (BOSTON)