311-039
Lamp-Base Thread EMI/RFI Shrink Boot Adapter
with Strain Relief and Optional Shrink Boot
Self-Locking - Rotatable Coupling - Standard Profile
311 F J 039 M 16 03 E T
311
CONNECTOR
DESIGNATORS
Product Series
Connector Designator
Angle and Profile
J = 90°
H = 45°
S = Straight
Basic Part No.
Shrink Boot (Table IV -
Omit for none)
E = Strain Relief
(Omit for nut)
Cable Entry (Table IV)
Shell Size (Table I)
Finish (Table II)
A-F-H-L-S
SELF-LOCKING
ROTATABLE
COUPLING
O-Ring
2.00 (50.8)
Max
A Thread
(Table I)
1.50
(38.1)
Max
E Typ.
(Table I)
K
Cable
Entry
(Table
IV)
Cable
Entry
L
(Table
IV)
STYLE 2
(STRAIGHT
See Note 5)
Anti-Rotation
Device
Typ.
STYLE E
STRAIN RELIEF
F
(Table III)
H
(Table III)
G (Table III)
1.00 (25.4)
Max
Cable
Entry
J (Table III)
K (Table IV)
.140/.130
(3.6/3.3)
Typ.
STYLE 2
(45° & 90°
See Note 5)
© 2005 Glenair, Inc.
CAGE Code 06324
Printed in U.S.A.
GLENAIR, INC.
•
1211 AIR WAY
•
GLENDALE, CA 91201-2497
•
818-247-6000
•
FAX 818-500-9912
www.glenair.com
E-Mail: sales@glenair.com
Series 311 - Page 12
with Strain Relief and Optional Shrink Boot
Self-Locking - Rotatable Coupling - Standard Profile
See inside back cover fold-out
or pages 13 and 14
for Tables I and II.
SHELL SIZE
A-F-L-S H
08
09
10
11
12
13
14
15
16
17
19
18
20
21
22
23
25
24
TABLE III: DIMENSIONS
F
G
H
Max
Max
Max
.795 (20.2) 1.045 (26.5)
.906 (23.0)
.820 (20.8) 1.075 (27.3)
.966 (24.5)
.844 (21.4) 1.097 (27.9) 1.026 (26.1)
.861 (21.9) 1.125 (28.6) 1.076 (27.3)
.888 (22.6) 1.145 (29.1) 1.136 (28.9)
.904 (23.0) 1.165 (29.6) 1.176 (29.9)
.929 (23.6) 1.195 (30.4) 1.236 (31.4)
.956 (24.3) 1.215 (30.9) 1.296 (32.9)
.979 (24.9) 1.245 (31.6) 1.356 (34.4)
J
Max
1.155 (29.3)
1.225 (31.1)
1.285 (32.6)
1.345 (34.2)
1.405 (35.7)
1.455 (37.0)
1.525 (38.7)
1.575 (40.0)
1.645 (41.8)
Dash
No.
01
02
03
04
05
06
07
08
09
TABLE IV: CABLE ENTRY/DIMENSIONS/SHRINK BOOT
Shrink
K
L
Cable Entry
Boot
Max
Max
Max
.448 (11.4)
.781 (19.8)
.125 (3.2) 770-003S111
.515 (13.1)
.968 (24.6)
.250 (6.4) 770-003S112
.640 (16.3)
1.046 (26.6)
.375 (9.5) 770-003S103
.765 (19.4)
1.156 (29.4)
.500 (12.7) 770-001S103
.920 (23.4)
1.219 (31.0)
.625 (15.9) 770-001S104
1.015 (25.8)
1.343 (34.1)
.750 (19.1) 770-001S104
1.140 (29.0)
1.469 (37.3)
.875 (22.2) 770-001S105
1.265 (32.1)
1.594 (40.5) 1.000 (25.4) 770-001S106
1.719 (43.7) 1.125 (28.6) 770-001S107
1.432 (36.4)
1. Cable Entry is defined as the accomodation range for the wire bundle or
cable. Dimensions shown are not intended for inspection criteria.
2. See Shrink Boot Reference Information (page 40).
3. Metric dimensions (mm) are indicated in parentheses.
4. O-Ring not supplied with Connector Designator A.
5. When maximum entry (page 21) is exceeded, Style 2 will be supplied.
Dimensions F, G, H & J will not apply. Please consult factory.
GLENAIR
SYMBOL
B
M
NF
TABLE II - STANDARD FINISHES
FINISH
Cadmium Plate, Olive Drab
Electroless Nickel
Cadmium Plate, Olive Drab Over
Electroless Nickel
See Inside Back Cover for Complete Finish
Information and Additional Finish Options
© 2005 Glenair, Inc.
CAGE Code 06324
Printed in U.S.A.
GLENAIR, INC.
•
1211 AIR WAY
•
GLENDALE, CA 91201-2497
•
818-247-6000
•
FAX 818-500-9912
www.glenair.com
E-Mail: sales@glenair.com
Series 311 - Page 13
311
311-039
Lamp-Base Thread EMI/RFI Shrink Boot Adapter
How
to Order
GLENAIR
SYMBOL
A
B
C*
G*
J
LF
M
N
NC
NF
T
U
ZU**
ZN
*
**
W
N
A
M85049 SYMBOL
REFERENCE ONLY
FINISH
Cadmium Plate, Bright
Anodize, Black
Hard Coat, Anodic
Electroless Nickel
Cadmium Plate, Black
Cadmium Plate, Black
Reference Information
Standard Materials and Finishes
TABLE II - STANDARD FINISHES
SPECIFICATION(S)
AMS-QQ-P-416, Type I, Class 2
AMS-QQ-P-416, Type II, Class 3
AMS-A-8625, Type II, Class 2
AMS-A-8625, Type III, Class 1
Cadmium Plate, Olive Drab
Iridite, Gold Over Cadmium Plate Over MIL-C-5541, Class 3 AMS-QQ-P-416, Type II,
Electroless Nickel
Class 3 over AMS-C-26074, Class 4, Grade B
Cadmium Plate, Bright Over
Electroless Nickel
Cadmium Plate, Olive Drab Over
Electroless Nickel
Zinc Cobalt, Dark Olive Drab
Cadmium Plate, Olive Drab Over
Electroless Nickel
Cadmium Plate, Bright Over
Electroless Nickel
1000 Hour Corrosion Resistance
AMS-C-26074, Class 4, Grade B
AMS-QQ-P-416, Type II, Class 3 over Electroless Nickel
AMS-C-26074
96 Hour Corrosion Resistance
1000 Hour Corrosion Resistance
AMS-QQ-P-416, Type I, Class 3
ASTMB 733-90, SC2, Type I, Class 5, MIL-C-26074***
AMS-QQ-P-416, Type II, Class 3
AMS-QQ-P-416, Type II, Class 3
ASTMB 841-91, Over Electroless Nickel 1000 Hour Salt
Spray
Zinc-Nickel Alloy, Olive Drab
Anodize finish; not suitable for EMI Shielding or grounding applications.
Applicable to corrosion resisting steel backshells and accessories. Consult factory for other available finishes.
The following standard materials are used for the majority of Glenair
backshells and connector accessories. However, backshell compo-
nents are not limited to those items listed, but are representative of
the elements used in Glenair's general accessory products. Contact
Glenair for applicable specifications on items not listed below.
STANDARD MATERIALS - BACKSHELLS AND ACCESSORIES
COMPONENT
Machined components: such as backshell bodies, fabricated elbows, protective covers,
rotatable couplers, dummy stowage receptacles, lock nuts, G-spring support rings,
EMI ground rings, grommet followers, etc.
Die cast components: such as angular backshells, strain relief backshells, strain relief
bodies, strain relief saddles, special EMI ground rings, etc.
Backshells or strain reliefs: available in optional corrosion resisting steel; and
hardware: such as screws, washers, rivets, wire rope, sash chain, band straps, etc.
Elastomeric seals: such as O-rings, cable jacket seals, grommets, etc.
Anti-friction and thrust washers
Anti-rotation device
MATERIAL
Aluminum
SPECIFICATION
AMS-QQ-A-200
ASTMB221, 209
QQ-A-591
ASTMB85, 26
Corrosion Resisting Steel ASTMA582 (300 Series)
AMS-QQ-S-763
Silicone
ZZ-R-765, MIL-R-25988
Teflon
TFE
N/A
Corrosion Resistant
Material
Aluminum
BODY STRAP
Glenair offers an optional stainless steel body strap for
attaching protective covers as illustrated. To specify body
strap, add suffix letter C to the end of the part number. For
example 360AS001M1610M6C.
NOTES
On all length callouts, tolerance is ± .060 unless otherwise
specified.
Unless otherwise specified, the following other dimensional
tolerances will apply:
.xx = ± .03 (0.8)
.xxx = ± .015 (0.4)
Lengths = ± .060 (1.52)
Angles = ± 5°
Metric dimensions (mm) are indicated in parentheses
2-56 Screw and Nut
© 2005 Glenair, Inc.
NOTE: For your convenience these tables have
been reproduced inside the back cover fold-out.
CAGE Code 06324
Printed in U.S.A.
GLENAIR, INC.
•
1211 AIR WAY
•
GLENDALE, CA 91201-2497
•
818-247-6000
•
FAX 818-500-9912
www.glenair.com
E-Mail: sales@glenair.com
14
Glenair Backshell and Accessory Material and Finish Options
Backshell and accessory base materials, plating options, specifications and codes
Code
A
AB
AL
B
C
E
G
J
JF
LF
M
MT
N
NC
NF
P
T
TP2
U
UC
UCR
UF
XAL
XB
XM
XMT
XO
XW
XZN
Z1
Z2
ZC
ZCR
ZL
ZM
ZMT
ZN
ZNU
ZR
ZU
ZW
Material
Aluminum
Marine Bronze
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Stainless Steel
Aluminum
Titanium
Aluminum
Aluminum
Aluminum
Aluminum
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Stainless Steel
Aluminum
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Aluminum
Aluminum
Aluminum
Stainless Steel
Stainless Steel
Finish
Cadmium, No Chromate
Unplated
AlumiPlate, Clear Chromate
Cadmium, Olive Drab
Anodize, Black
Chem Film
Anodize, Hardcoat
Cadmium, Gold
Cadmium, Gold
Cadmium, Clear
Electroless Nickel
Nickel-PTFE
Cadmium, Olive Drab
Zinc-Cobalt, Olive Drab
Cadmium, Olive Drab
Electrodeposited Nickel
Cadmium, No Chromate
Electrodeposited Nickel
Cadmium, Black
Zinc-Cobalt, Black
Zinc-Cobalt, Black
Cadmium, Black
AlumiPlate
Unplated Black
Electroless Nickel
Nickel-PTFE
Unplated Light Brown
Cadmium, Olive Drab
Zinc-Nickel, Black
Passivate
Gold
Zinc-Cobalt, Black
Zinc-Cobalt, Black
Electrodeposited Nickel
Electroless Nickel
Nickel-PTFE
Zinc-Nickel, Olive Drab
Zinc-Nickel, Black
Zinc-Nickel, Black
Cadmium, Black
Cadmium, Olive Drab
Finish Specification
SAE-AMS-QQ-P-416 Type I Class 3
MIL-DTL-83488, Class 2, Type II over electroless nickel
SAE-AMS-QQ-P-416 Type II Class 3
AMS-A-8625 Type II Class 2
MIL-DTL-5541 Type 1 Class 3
AMS-A-8625 Type III, Class 1, .001" thick
SAE-AMS-QQ-P-416 Type II, Class 2 over electroless nickel
SAE-AMS-QQ-P-416 Type II, Class 2 over electroless nickel
SAE-AMS-QQ-P-416 Type II Class 2 over electroless nickel
AMS-C-26074 Class 4 Grade B; ASTM-B-733, SC 2, Type IV
GMF-002 Type II Class 1
SAE-AMS-QQ-P-416 Type II Class 3 over electroless nickel
ASTM B 840 Grade 6 Type D over electroless nickel
SAE-AMS-QQ-P-416 Type II Class 2 over electroless nickel
SAE-AMS-QQ-N-290 Class 1 Grade F
SAE-AMS-QQ-P-416 Type I Class 3
SAE-AMS-QQ-N-290 Class 1 Grade F
SAE-AMS-QQ-P-416 Type I Class 3
ASTM B 840 Grade 6 Type D over electroless nickel
ASTM B 840 Grade 6 Type D over electroless nickel
SAE-AMS-QQ-P-416 Type II Class 2 over electroless nickel
MIL-DTL-86448, Class 2, Type II over electroless nickel
AMS-C-26074
GMS-002 Class 2 Type II
SAE-AMS-QQ-P-416 Type II Class 3 over electroless nickel
ASTM B841 Grade 5 over electroless nickel
SAE-AMS-SAE-AMS-QQ-P-35 Type VI
MIL-DTL-45204 Class 1 over electroless nickel
ASTM-B840, Grade 6
ASTM-B840, Grade 6
SAE-AMS-QQ-N-290 Class 1 Grade F
AMS-C-26074 Class 1 Grade A
GMF-002 Type II Class 3
ASTM B841 Grade 5 over electroless nickel
ASTM B841 Grade 5 over electroless nickel
ASTM B841 Grade 5 over electroless nickel
SAE-AMS-QQ-P-416 Type II Class 3
SAE-AMS-QQ-P-416 Type II Class 2 over electroless nickel
Hrs. Salt
Spray
48
1000
1000
96
336
168
336
500
1000
1000
48
1000
500
350
1000
500
48
96
48
350
350
1000
2000
2000
2000
2000
2000
2000
2000
1000
48
Electrical
Conductivity
Conductive
Conductive
Conductive
Conductive
Non-Conductive
Conductive
Non-Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Non-Conductive
Conductive
Conductive
Non-Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Conductive
Operating Temp.
Range
-65 to +175°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +200°C
-65 to +175°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +200°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +200°C
-65 to +200°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
-65 to +175°C
Notes
Not recommended for new projects. LF is preferred.
Marine and geophysical applications.
Approved for MIL-DTL-38999L and MIL-DTL-83513G.
Not recommended for new projects. NF is preferred.
Glenair’s standard black anodize finish.
Glenair’s standard chem film finish.
Glenair’s preferred hardcoat finish.
Not recommended for new projects. JF is preferred.
Glenair’s preferred gold cadmium finish.
Glenair’s preferred clear cadmium finish.
Glenair’s standard electroless nickel finish.
Approved for MIL-DTL-38999L and MIL-DTL-83513G.
Not recommended for new projects. NF is preferred.
Glenair’s standard olive drab zinc-cobalt finish.
Glenair’s standard olive drab cadmium finish.
Use ZM for electroless nickel alternative.
Not recommended for new projects. LF is preferred.
Glenair’s preferred finish for titanium connectors.
Not recommended for new projects. UF is preferred.
Glenair’s standard black zinc-cobalt finish.
RoHS version of UC.
Glenair’s preferred black cadmium finish.
Approved for MIL-DTL-38999L.
Glenair’s standard unplated composite.
Glenair’s standard electroless nickel finish over composite.
Approved for MIL-DTL-38999L.
Not recommended for new projects. Use XB.
Glenair’s standard olive drab cadmium finish over composite.
Glenair’s standard black zinc-nickel finish over composite.
Glenair’s standard passivated stainless steel.
Glenair’s standard gold plating for space programs.
Glenair’s standard zinc-cobalt over stainless steel.
RoHS version of ZC.
Used on hermetic connectors. Use ZM for other applications.
Glenair’s preferred nickel-plated stainless steel.
Glenair’s new 1000 Hour Grey over stainless steel.
Glenair’s standard olive drab zinc-nickel finish.
Glenair’s standard black zinc-nickel finish.
Glenair’s RoHs compliant black zinc-nickel.
Glenair’s standard black cadmium over stainless steel.
Glenair’s standard olive drab cadmium over stainless steel.
1000
1000
1000
1000
500
1000
2000
TABLE I - BACKSHELL INTERFACE DIMENSIONS
A
C*
D
08
E
08
F
08 [9]
G
H
09 [A]
08
08 [A]
03
10
10 [B]
12
12 [7] 12
14
14 [12] 14
16
16 [19] 16
18 [27]
18
20 [37]
20
22
22
22 [H]
24
61
24 [J]
25 [G]
24
28
28
32
32
36
36
40
40
40
44
44
48
48
33 [J]
36
29 [H]
32
28
24
24
24 [25] 23 [F]
25 [J]
24
24
22
22
22 [23]
23 [H]
24
20
20
20 [21]
21 [G]
19 [E]
20 [G]
22
22
22
18
18
18 [19]
19 [F]
17 [D]
18 [F]
20
20
20
16
16 [17]
17 [E]
15 [C]
16 [E]
18
18
18
12
14
12 [13]
13 [C]
11 [A]
14 [15]
15 [D]
13 [B]
14 [D]
16
16
16 [17]
14 [15]
14
14
12
12
10
10
10 [11]
11 [B]
12 [13]
10
11
10
10
J
K
08
L
08
S
08
.770 (19.6)
.890 (22.6)
.890 (22.6)
1.020 (25.9)
1.020 (25.9)
1.150 (29.2)
1.150 (29.2)
1.260 (32.0)
1.230 (31.2)
1.400 (35.6)
1.360 (34.5)
1.530 (38.9)
1.480 (37.6)
1.600 (40.6)
(40.6)
(49.3)
.820 (20.8)
1.060 (26.9)
.820 (20.8)
.940
1.170
.940
1.060
1.290
1.060
(23.8)
(29.7)
(23.8)
(26.9)
(32.7)
(26.9)
1.170 (29.7)
1.420 (36.1)
1.170 (29.7)
1.290 (32.7)
1.540 (39.1)
1.420 (36.0)
1.670 (42.4)
1.540 (39.1)
2.010 (51.1)
1.840 (46.7)
1.970 (50.0)
2.090 (53.1)
2.280 (57.9)
2.340 (59.4)
2.340 (59.4)
2.530 (64.3)
2.590 (65.8)
2.590 (65.8)
2.780 (70.6)
2.910 (73.9)
3.030 (77.0)
3.160 (80.3)
3.220 (81.8)
3.410 (86.6)
1.600
(43.9)
(43.9) 1.940
(43.2)
(42.4)
(49.3)
(46.2)
1.940
1.970 (50.0)
2.190 (55.6) 2.190
2.220 (56.4)
2.440 (62.0) 2.440
2.440
2.47 (62.7)
2.690
2.690
2.720 (69.1)
2.930
2.970 (75.4)
1.730
1.730
1.700
1.670
1.940
1.820
3.220 (81.8)
1.660 (42.2)
2.120 (53.8)
(49.3)
2.010 (51.1)
(55.6)
2.260 (57.4)
(62.0)
(62.0)
2.530 (64.3)
(68.3)
(68.3)
3.040 (77.2)
(74.4)
* Code C, MIL-C-22992, Left-Hand Thread. Connector designations depicted thus [ ] are for reference only and are not to be used in part number development.
BACKSHELL INTERFACE STANDARDS (See pages 15-17 for more information)
DESIG. SPEC.
SERIES
DESIG. SPEC.
SERIES
A
MIL-DTL-5015 MS3400
A
PATT 602
MIL-DTL-26482 2
B
MIL-DTL-5015 MS3100
AS81703
3
C
MIL-C-22992 MS173XX
MIL-DTL-83723 I & III
D
MIL-DTL-26482 1
40M39569
E
MIL-DTL-26500 Aluminum
DEF 5326-3
F
MIL-DTL-38999 I & II
EN 2997, 3646
40M38277
ESC 10, 11
PAN 6433-1
LN 29504
PATT 614
NFC93422 HE302
PATT 616
PAN 6432-1, -2
NFC93422
HE308, 9
DESIG. SPEC.
SERIES
G
MIL-C-28840
H
MIL-DTL-38999 III & IV
EN3645
J
MIL-C-81511 1, 2, 3 & 4
VG95329
K
MIL-DTL-83723 II
DESIG. SPEC.
L
EN3372
JN 1003
LN 29729
NFC93422
PAN 6433-2
PATT 615
VG 96912
S
PATT 105
PATT 603
PATT 608
SERIES
HE306
13
How
to Order
CONNECTOR DESIGNATOR
A THREAD*
REFERENCE
7/16 – 28 UNEF
M12 x 1 – 6H
1/2 – 20 UNF
1/2 – 28 UNEF
9/16 – 24 UNEF
M15 x 1 – 6H
5/8 – 24 UNEF
5/8 – 28 UN
11/16 – 24 UNEF
M18 x 1 – 6H
3/4 – 20 UNEF
13/16 – 20 UNEF
M22 x 1 – 6H
7/8 – 20 UNEF
7/8 – 28 UN
15/16 – 20 UNEF
M25 x 1 – 6H
1 – 20 UNEF
1 - 28 UN
1 1/16 – 18 UNEF
M28 x 1 – 6H
1 1/8 – 18 UNEF
1 1/8 – 28 UN
1 3/16 – 18 UNEF
M31 x 1 – 6H
1 1/4 – 18 UNEF
1 1.4 – 28 UN
1 5/16 – 18 UNEF
M34 x 1 - 6H
1 3/8 – 18 UNEF
1 3/8 – 28 UN
1 7/16 – 18 UNEF
M37 x 1 – 6H
1 1/2 – 18 UNEF
1 1/2 – 28 UN
1 9/16 – UNEF
1 5/8 – UNEF
1 3/4 – 18 UNS
1 7/8 – 16 UN
2 – 18 UNS
2 1/16 – 16 UNS
2 1/8 – 16 UN
2 1/4 – 16 UN
2 5/16 – 16 UNS
2 3/8 – 16 UN
2 1/2 – 16 UN
2 5/8 – 16 UN
2 3/4 – 16 UN
2 7/8 – 16 UN
3 – 16 UN
3 1/16 – 16 UN
B
DIA MAX
.590 (15.)
.650 (16.5)
.650 (16.5)
.650 (16.5)
.720 (18.3)
.770 (19.6)
.770 (19.6)
.770 (19.6)
.840 (21.3)
.890 (22.6)
.970 (24.6)
.970 (24.6)
1.030 (26.2)
1.090 (27.7)
1.030 (26.2)
1.090 (27.7)
1.150 (29.2)
1.220 (29.2)
1.150 (29.2)
1.220 (31.0)
1.280 (32.5)
1.340 (34.0)
1.280 (32.5)
1.340 (34.0)
1.410 (35.8)
1.470 (37.3)
1.410 (35.8)
1.470 (37.3
1.530 (38.9)
1.590 (40.4)
1.530 (38.9)
1.590 (40.4)
1.660 (42.2)
1.660 (42.2)
1.660 (42.2)
C
DIA MAX
.650 (16.5)
.770 (19.6)
.650 (16.5)
.770 (19.6)
.770 (19.6)
.820 (20.8)
.770 (19.6)
.890 (22.6)
.890 (22.6)
.940 (23.9)
.940 (23.9)
1.020 (29.2)
1.070 (26.2)
1.020 (25.9)
1.150 (29.2)
1.150 (29.2)
1.210 (30.7)
1.210 (30.7)
1.360 (34.5)
1.230 (31.2)
1.360 (34.5)
1.360 (34.5)
1.480 (37.6)
1.360 (34.5
1.480 (37.6)
1.530 (38.9)
1.600 (40.6)
1.480 (37.6)
1.600 (40.6)
D
DIA MAX
.770 (19.6)
E
DIA MAX
.690 (17.5)
.940 (24.8)
.690 (17.5)
Microcontroller MCU
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