Tutorials/Flying machines/Driveable flying machines

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 * caption=2-way controllable Flying machine A layers 2-3
 * | |  |NB+ > |mc-ew|ib-w   |  |     |-
 * |obs-w|NB+ X<|obs-s|sp-w|  |  |     |-
 * | |  |sp-e|obs-n|NB+ >X} |obs-e|     |-
 * | |ib-e|mc-ew|NB+ <  |   |  |     |-
 * Dimensions: 8x4 collapsed
 * Notes: Iron bars are shown next to the minecarts; in fact these need to be fences(or walls).  Placing the minecarts will require a temporary block and rail.
 * Usage: To start left or right, click the note block with that arrow (behind you). To stop, spam-click the matching X'ed note block (ahead of you).
 * Credits: Sethbling February 29, 2019, "Simple 2-Way Controllable Flying Machine" (Video). YouTube