Draw the precedence diagram

iPhone Production Standards
Element ID	Work Element Decription	Precedence
A	Fixture and Secure the rear case (base)	---
B	Install the Lightning plug connector assembly into the rear case (base)	A
C	Affix (fasten) the lightning connector assembly; 4 screws	B
D	Install the Power Button	A
E	Install 3 side buttons (Mute switch and volume controlS)	C,D
F	Install the Power & Volume button flex cable assembly	E
G	Prepare the Wifi antenna assy	E,F
H	Install and fasten Blue tooth antenna PCBA assy	G
J	Secure/affix wifi and Bluetooth assemblies with metal bracket	G,H
K	install the taptic engine (vibrations & sensory motor) and secure the metal bracket	F
L	connect the side buttons to the power & volume flex cable	F
M	secure the button and cable assembly with 2 metal brackets and screws	K,L,J
N	Install the rear facing camera assembly (includes flex cable)	ojy
O	Install the front facing & infrared camera assembly (includes flex cable)	``
P	Install upper speaker assembly	M
Q	Quality check! Ensure proper fastening & function of the side buttons, toggle, Power, Vibration)	N,O,P
R	Prepare the SIM card tray and ejection mechanism/assembly	---
S	Install Logic board PCBA_1	Q
T	install Logic Board PCBA_2	Q
U	Connect the rear facing camera flex cable to PCBA_1	S
V	Connect the front facing camera with infrared camera assembly and IR flex cable to PCBA_2	T
W	Connect the power switch/volume flex cable to PCBA_1	S
X	Secure all cable connections with fasteners	U,V,W
Y	LCD screen & digitizer assembly is prepared by removing protective foils and attaching LCD to the digitizer via 4 screws	---
Z	Attach and Secure (with 2 screws) the home button assembly within the LCD screen frame (hole provided).	---
AA	Install front facing camera's flex cable assembly	V,Y,Z
BB	Install microphone and bottom speaker assembly and secure with metal bracket + 3 screws	AA
CC	Battery & Charging coil assembly is prepared by applying double-sided adhesive strip to both the battery assembly and the charging coil assembly.	---
DD	Install (adhere) the charging coil onto the battery pack	CC
EE	Adhere the battery/coil assembly into the case (base) by press/hold allowing the adhesive to settle.	DD
FF	Connect the LCD screen to the logic boards_PCBA_1/2 & secure with metal plates (2 plates) (6 screws)	Z, BB, EE
GG	Connect the home button flex cable to the logic board_PCBA	FF
HH	insert waterproofing gaskets	GG
JJ	Press/insert SIM card tray into side location of base/case	HH,X
KK	Snap-press together the base/case and LCD assembly to become an enclosed/finished assembly	JJ, R
LL	Secure the overall assembly with 2 screws in the lower end of the base/case assembly	KK
MM	Power up and test/inspect functionality of: screen touch activation, sounds, antennas, location services, swiping & setting of app preferences, battery health, cameras, utilities, and calling (send/receive), 360 Visual Check	LL
OO	Place phone into the fibreboard crate for transit to packaging depot (3rd party packager)	MM