#1
What does /4 mean when there's nothing before it to slide up from? For example

|--0---0-0-0--0-0---0-0-|
|---3/5-3-0-------------|
|-----------/4-2-0h2-0--|
|-----------------------|
|-----------------------|
|-0---------------------|

This is from a tab for losing you by the john butler trio
#2
You slide from somewhere to the 4th fret. When you put down your guitar flat on you lap, imagine like a plane lands on the 4th fret, coming from the nut
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