func (builder *Builder) Up(n uint) *Builder {
	return builder.With(Up(n))
}
Up is a syntax for Up.
package aec
type Builder struct {
	ANSI ANSI
}
var EmptyBuilder *Builder
func NewBuilder(a ...ANSI) *Builder {
	return &Builder{concat(a)}
}
func (builder *Builder) With(a ...ANSI) *Builder {
	return NewBuilder(builder.ANSI.With(a...))
}