input name prepay keyup function range_trigger_keyup this 20 40 blur f

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$('input[name="prepay"]')
.keyup(function(){range_trigger_keyup($(this), '20', '40')})
.blur(function(){range_trigger_blur($(this), '20', '40')});
$('input[name="prepay"]')
.keyup(function(){range_trigger_keyup($(this), '30', '40')})
.blur(function(){range_trigger_blur($(this), '30', '40')});
How unbind last piece code?