*/
  public static <E> ImmutableSet<E> of(E e1, E e2) {
    return construct(2, e1, e2);
  }

  /**
   * Returns an immutable set containing the given elements, minus duplicates, in the order each was
   * first specified. That is, if multiple elements are {@linkplain Object#equals equal}, all except
   * the first are ignored.
   */
  public static <E> ImmutableSet<E> of(E e1, E e2, E e3) {
    return construct(3, e1, e2, e3);
  }

>>> Flow 2 (server to client)
00000000  16 03 01 00 5d 02 00 00  59 03 01 48 c6 a1 aa 01  |....]...Y..H....|
00000010  b8 4b a1 f5 6d 71 28 f7  fd 76 9d 12 50 d3 56 e2  |.K..mq(..v..P.V.|
00000020  ca 77 d4 82 07 65 e2 c5  12 40 35 20 e3 ee 0a df  |.w...e...@5 ....|
00000030  1f 4a d9 b3 a6 6f a0 24  49 8d ab d9 d8 3c 24 36  |.J...o.$I....<$6|
00000040  35 ba 64 8b 7d ec 29 91  d9 26 5e 61 c0 13 00 00  |5.d.}.)..&^a....|

000001e0  75 ff d6 a9 dc 4f 30 37  52 07 87 cb 8d a7 4a 00  |u....O07R.....J.|
000001f0  22 53 3c 6d 91 94 11 5d  0a a8 21 ea 1f 18 4e 42  |"S<m...]..!...NB|
00000200  1f 11 ea 17 55 c5 0c e2  41 e2 1f 2b 7b 4c d7 72  |....U...A..+{L.r|
00000210  04 d6 64 45 e4 48 03 d7  ca ea 2b 78 0c 9b 03 b0  |..dE.H....+x....|
00000220  c6 14 cc d8 89 d4 4d 4a  82 b2 e4 69 e9 2e 7f cf  |......MJ...i....|

   * one specified is included.
   *
   * @throws NullPointerException if any element is null
   */
  public static <E extends Comparable<? super E>> ImmutableSortedSet<E> of(E e1, E e2) {
    return construct(Ordering.natural(), 2, e1, e2);
  }

  /**
   * Returns an immutable sorted set containing the given elements sorted by their natural ordering.

00000110  fe 97 ef 82 53 2e d0 e2  11 c6 ee 8d 25 d2 f0 5c  |....S.......%..\|
00000120  2e b8 61 40 09 12 d4 11  9b b8 3d 38 d7 d5 a7 76  |..a@......=8...v|
00000130  ed a7 bf 6f 39 9c 83 49  57 86 de 53 da c5 ff 8a  |...o9..IW..S....|
00000140  ee 47 bc 19 72 d3 cc d0  5b fc 6b 25 2f 64 2a 0c  |.G..r...[.k%/d*.|
00000150  7d e9 8a 1f f8 48 d1 74  d5 70 97 e7 b4 e2 c8 ce  |}....H.t.p......|

			},
			parseVector(`secret (32 octets):  33 ad 0a 1c 60 7e c0 3b 09 e6 cd 98 93 68 0c
			e2 10 ad f3 00 aa 1f 26 60 e1 b2 2e 10 f1 70 f9 2a`),
		},
		{
			`extract secret "master"`,
			args{
				nil,
				parseVector(`salt (32 octets):  43 de 77 e0 c7 77 13 85 9a 94 4d b9 db 25 90 b5
				31 90 a6 5b 3e e2 e4 f1 2d d7 a0 bb 7c e2 54 b4`),
			},
			parseVector(`secret (32 octets):  18 df 06 84 3d 13 a0 8b f2 a4 49 84 4c 5f 8a

000001c0  b6 5f 70 dd 9b d8 ea d5  d7 f5 d5 cc b9 b6 9f 30  |._p............0|
000001d0  66 5b 66 9a 20 e2 27 e5  bf fe 3b 30 09 06 07 2a  |f[f. .'...;0...*|
000001e0  86 48 ce 3d 04 01 03 81  8c 00 30 81 88 02 42 01  |.H.=......0...B.|
000001f0  88 a2 4f eb e2 45 c5 48  7d 1b ac f5 ed 98 9d ae  |..O..E.H}.......|
00000200  47 70 c0 5e 1b b6 2f bd  f1 b6 4d b7 61 40 d3 11  |Gp.^../...M.a@..|

00000310  79 a0 d0 48 32 5a 02 58  70 81 d0 b6 6d 77 2f 6f  |y..H2Z.Xp...mw/o|
00000320  4e 9b db ca 82 38 ed a6  60 8e e2 b6 14 33 f5 02  |N....8..`....3..|
00000330  4b 97 a4 86 2f 43 9d ee  88 2c 1c 58 7e 47 30 cc  |K.../C...,.X~G0.|
00000340  ec 0d aa 22 13 60 be e2  c9 c4 59 90 67 96 9b 2a  |...".`....Y.g..*|
00000350  41 79 49 00 71 80 e9 0d  12 c3 17 03 03 00 99 ec  |AyI.q...........|

   * one specified is included.
   *
   * @throws NullPointerException if any element is null
   */
  public static <E extends Comparable<? super E>> ImmutableSortedSet<E> of(E e1, E e2) {
    return construct(Ordering.natural(), 2, e1, e2);
  }

  /**
   * Returns an immutable sorted set containing the given elements sorted by their natural ordering.

00000030  16 03 03 00 20 7b de 6f  c8 b7 f1 69 89 0b 29 af  |.... {.o...i..).|
00000040  62 1b 92 47 e9 44 f7 26  91 93 9c 3b e2 77 0e d0  |b..G.D.&...;.w..|
00000050  c5 af fd e5 59                                    |....Y|
>>> Flow 4 (server to client)
00000000  14 03 03 00 01 01 16 03  03 00 20 94 da e2 2e f3  |.......... .....|
00000010  65 59 31 4f 58 42 57 b5  1f e6 c1 5a c6 07 97 12  |eY1OXBW....Z....|