# Select
⍤⤙≍ "h!!i" ⊏ [0 2 2 1] "hi!"
⍤⤙≍ [] ≡⊏ 3 °△0_4
⍤⤙≍ "" ≡⊏ 3 +@0°△0_4
⍤⤙≍ {} ≡⊏ 3 ≡₀□°△0_4
# Pick
⍤⤙≍ [] ≡⊡ 3 °△0_4
⍤⤙≍ "" ≡⊡ 3 +@0°△0_4
⍤⤙≍ {} ≡⊡ 3 ≡₀□°△0_4
# Anti pick
⍤⤙≍ [0_0_0 0_0_1] ⬚0⌝⊡ [1_2 1_2] [1 1]
⍤⤙≍ [0_2_0 0_0_1] ⬚0⌝⊡ [0_1 1_2 1_2] [2 1 1]
⍤⤙≍ [0_0_0_0 0_0_1_2] ⬚0⌝⊡ [1_3 1_2 1_2] [2 1 1]
# Orient
⍤⤙≍ °⍉⟜(⤸¯1) °△ 2_3_4
⍤⤙≍ °⍉⟜(⤸2) °△ 2_3_4
⍤⤙≍ ≡⍉⟜(⤸0_2) °△ 2_3_4
⍤⤙≍ ≡°⍉≡≡⍉°⍉≡≡⍉⟜(⤸2_1) °△ 2_3_4_5
⍤⤙≍ [2 3 4 5 1 6] △ ⤸1_2_3_4 °△ [1 2 3 4 5 6]
⍤⤙≍ ⬚0[1 0_2 0_0_3 0_0_0_4] ⬚0⤸ 0_0 [1 2 3 4]
⍤⤙≍ [[1_2 0_0] [0_0 3_4]] ⬚0⤸ 0_0 [1_2 3_4]
⍤⤙≍ [[1_0 0_0] [0_0 0_2]] ⬚0⤸ 0_0_0 [1 2]
⍤⤙≍ [[1_2 0_0]_[3_4 0_0] [0_0 5_6]_[0_0 7_8]] ⬚0⤸ 0_1_0 +1°△2_2_2
# Anti orient
⍤⤙≍ ⍉⟜(⌝⤸¯1) °△ 2_3_4
⍤⤙≍ ⍉⟜(⌝⤸2) °△ 2_3_4
⍤⤙≍ ≡°⍉⟜(⌝⤸0_2) °△ 2_3_4
⍤⤙≍ [4 3 2 5] △⌝⤸2_1 °△ 2_3_4_5
⍤⤙≍ [5 1 2 3 4 6] △ ⌝⤸1_2_3_4 °△ [1 2 3 4 5 6]
⍤⤙≍ [0_1_2 12_13_14 24_25_26] ⌝⤸ 0_0 °△3_3_3
⍤⤙≍ [0_1_2 12_13_14 24_25_26] ⌝⤸ 0_0_1 °△3_3_3
⍤⤙≍ [0_9_18 4_13_22 8_17_26] ⌝⤸ 1_0_0 °△3_3_3
⍤⤙≍ [0_4_8 9_13_17 18_22_26] ⌝⤸ 0_1_1 °△3_3_3
⍤⤙≍ [0_10_20 3_13_23 6_16_26] ⌝⤸ 1_0_1 °△3_3_3
⍤⤙≍ [0 13 26] ⌝⤸ 0_0_0 °△3_3_3
⍤⤙≍ [0_1_2_3 16_17_18_19] ⌝⤸ 0_0 °△2_3_4
⍤⤙≍ [0_1_2_3 16_17_18_19] ⌝⤸ 0_0_1 °△2_3_4
⍤⤙≍ [0_12 5_17 10_22] ⌝⤸ 1_0_0 °△2_3_4
⍤⤙≍ [0_5_10 12_17_22] ⌝⤸ 0_1_1 °△2_3_4
⍤⤙≍ [0_13 4_17 8_21] ⌝⤸ 1_0_1 °△2_3_4
⍤⤙≍ [0 17] ⌝⤸ 0_0_0 °△2_3_4
# Reshape
⍤⤙≍ [5 5 5 5 5] ↯5 5
⍤⤙≍ [0_1_2 3_4_5 6_7_8] ↯3_3⇡9
⍤⤙≍ [0_1_2_3 4_5_0_1 2_3_4_5] ↯3_4⇡6
⍤⤙≍ [1 2 3 1 2 3 1 2 3 1] ↯[10] [1 2 3]
⍤⤙≍ [1_2_3_1 2_3_1_2] ↯[2 4] [1 2 3]
⍤⤙≍ [8 2] △ ↯∞_¯2 °△ 4_4
⍤⤙≍ [1_2_3 ⟜∘ 0_0_0] ⬚0↯3 1_2_3
⍤⤙≍ [1 2 3 0 0] ⬚0↯[5] 1_2_3
# Rotate
⍤⤙≍ [3_4_5 6_7_8 0_1_2] ↻1↯3_3⇡10
⍤⤙≍ [2 3 0] ⬚0 ↻1 [1 2 3]
⍤⤙≍ [3 4 5 0 0] ⬚0↻ 2 [1 2 3 4 5]
⍤⤙≍ [0 0 1 2 3] ⬚0↻ ¯2 [1 2 3 4 5]
⍤⤙≍ [] ↻1[]
⍤⤙≍ [] ↻0_1[]
⍤⤙≍ [] ↻1_1[]
⍤⤙≍ °△0_0 ↻1°△0_0
⍤⤙≍ ⊃≡↻⬚0≡↻ °⊏°△˙⊟5
⍤⤙≍ □[2 3 1] ⍚↻1 □[1 2 3]
⍤⤙≍ {↻1⇡4 ↻2⇡5} ⍚↻ [1 2] {⇡4 ⇡5}
⍤⤙≍ ↯3_3 1 /+♭₃ ↻°⊡ ⬚0↯3_3 1
⍤⤙≍ ["abc" "bc " "c "] ⬚@ ↻≡¤°⊏ "abc"
⍤⤙≍ ["abc" " ab" " a"] ⬚@ ⌝↻≡¤°⊏ "abc"
⍤⤙≍ [2 3 4 0] ⬚0↻1 [1 2 3 4]
⍤⤙≍ [0 1 2 3] ⬚0⌝↻1 [1 2 3 4]
⍤⤙≍ [0_1 1_0 0_1 1_0 0_1] ≡↻ ⇡5 °△1_2
⍤⤙≍ °△3_0 ⬚[]↻1 [[][][]]
⍤⤙≍ [2 3 4 τ τ] ⬚τ↻₂ ⇡5
⍤⤙≍ [2_2 3_3 4_4 π_τ π_τ] ⬚π_τ↻2 ⍉˙⊟ ⇡5
⍤⤙≍ ⬚0[7_8_9_0_0 12_13_14 17_18_19 0] ⬚0↻ 1_2 ↯4_5⇡20
⍤⤙≍ [[8_9 10_11 π_τ] [14_15 16_17 π_τ] [π_τ π_τ π_τ]] ⬚π_τ↻ 1_1 °△3_3_2
⍤⤙≍ [[1]] ⬚1↻1_1 [[5]]
⍤⤙≍ [[1 1]] ⬚1↻1_1 [[5 6]]
# Take and drop
⍤⤙≍ [1] ↙1 [1 2 3 4]
⍤⤙≍ [1 2] ↙2 [1 2 3 4]
⍤⤙≍ [0_1_2] ↙1 °△3_3
⍤⤙≍ [2 3 4] ↘1 [1 2 3 4]
⍤⤙≍ [3 4] ↘2 [1 2 3 4]
⍤⤙≍ [3_4_5 6_7_8] ↘1 °△3_3
⍤⤙≍ [8 9] ↙¯2 ⇡10
⍤⤙≍ ⇡8 ↘¯2 ⇡10
⍤⤙≍ ↘1⟜(↙¯2) °△3_3
⍤⤙≍ [[3]] ↘1_1 °△2_2
⍤⤙≍ 0_0 △ ↘2_2 °△2_2
⍤⤙≍ 0_0 △ ↘3_3 °△2_2
⍤⤙≍ [[8]] ↙¯1_¯1 °△3_3
⍤⤙≍ [[0]] ↘¯2_¯2 °△3_3
⍤⤙≍ ⊚5 ⬚0↙5 []
⍤⤙≍ ⊚5 ⬚0↙¯5 []
⍤⤙≍ ↯⟜⊚5 ⬚0↙5_5 °△0_0
⍤⤙≍ ↯⟜⊚5 ⬚0↙¯5_¯5 °△0_0
⍤⤙≍ ↯⟜⊚5 ⬚0↙¯5_5 °△0_0
⍤⤙≍ ↯⟜⊚5 ⬚0↙5_¯5 °△0_0
⍤⤙≍ [1_2 3_4 ⟜∘ 5_6] ⬚5_6↙ 4 [1_2 3_4]
⍤⤙≍ [⟜∘ 5_6 1_2 3_4] ⬚5_6↙ ¯4 [1_2 3_4]
⍤⤙≍ [[1_2 3_4 0_π] [5_6 7_8 0_π] ↯3 0_π] ⬚0_π↙3_3 [[1_2 3_4] [5_6 7_8]]
⍤⤙≍ [↯3 0_π [0_π 1_2 3_4] [0_π 5_6 7_8]] ⬚0_π↙¯3_¯3 [[1_2 3_4] [5_6 7_8]]
⍤⤙≍ [[12_13 16_17 20_21]] ↙¯1_∞_2 ↯2_3_4⇡24
⍤⤙≍ ⟜(+∩△⊃↙↘ 1_∞_1_¯2 ↯)2_3_4_5⇡120
⍤⤙≍ ∩(↙3) ⟜(+∩△⊃↙↘ 1_∞_1 ↯)2_3_4_5⇡120
⍤⤙≍ [[0_1 2_3 0_0] [4_5 6_7 0_0] ↯3_2 0] ⬚0↙3_3 ↯⟜(⇡/×) ↯3 2
⍤⤙≍ [↯3_2 0 [0_1 2_3 0_0] [4_5 6_7 0_0]] ⬚0↙¯3_3 ↯⟜(⇡/×) ↯3 2
⍤⤙≍ [1 2] ⬚[1_2 3_4]↙2 [1 2 3 4]
# Anti drop
⍤⤙≍ °△3_0 ⌝↘ 1 °△2_0
⍤⤙≍ °△3_0 ⬚[](⌝↘) 1 °△2_0
⍤⤙≍ [0 0 1 2 3] ⌝↘ 2 [1 2 3]
⍤⤙≍ [1 2 3 0 0] ⌝↘ ¯2 [1 2 3]
⍤⤙≍ [0_0 1_2 3_4] ⌝↘ 1 [1_2 3_4]
⍤⤙≍ [0_0_0 0_1_2 0_3_4] ⌝↘ 1_1 [1_2 3_4]
⍤⤙≍ [↯2⊚2 [⊚2 1_2] [⊚2 3_4]] ⌝↘ 1_1 +1°△2_1_2
⍤⤙≍ [↯2⊚3 [⊚3 0_1_2] [⊚3 0_3_4]] ⌝↘ 1_1_1 +1°△2_1_2
⍤⤙≍ ↯3_1 0 ⌝↘ 1_1 ↯2_0 []
⍤⤙≍ ↯1_3 0 ⌝↘ 1_1 ↯0_2 []
⍤⤙≍ [[0_0_0 0_1_2 0_3_4] [0_0_0 0_5_6 0_7_8]] ⌝↘0_1_1 +1°△2_2_2
⍤⤙≍ [[1_2_0 3_4_0 0_0_0] [5_6_0 7_8_0 0_0_0]] ⌝↘0_¯1_¯1 +1°△2_2_2
# Un take
⍤⤙≍ {5 1_2_3} {°⬚0↙} [1 2 3 0 0]
⍤⤙≍ {10 "hello"} {°⬚@ ↙} "hello "
⍤⤙≍ {7 "wow"} {°⬚@-↙} "wow----"
⍤⤙≍ {4_5 +1°△3_2} {°⬚0↙} [1_2_0_0_0 3_4_0_0_0 5_6_0_0_0 0_0_0_0_0]
⍤⤙≍ {3_4 [1_2_0 3_4_5 6_0_0]} {°⬚0↙} [1_2_0_0 3_4_5_0 6_0_0_0]
⍤⤙≍ {4 [1_2_0 3_4_5 6_0_0]} {°⬚0↙} [1_2_0 3_4_5 6_0_0 0_0_0]
⍤⤙≍ {2_2 [[1_2]]} {°⬚0↙} [[1_2 0_0] [0_0 0_0]]
# Keep
⍤⤙≍ [1 2 3] ▽ [1 1 1] [1 2 3]
⍤⤙≍ [2 3] ▽ [0 1 1] [1 2 3]
⍤⤙≍ [1 3] ▽ [1 0 1] [1 2 3]
⍤⤙≍ [1 2] ▽ [1 1 0] [1 2 3]
⍤⤙≍ [1 1 2 3] ▽ [2 1 1] [1 2 3]
⍤⤙≍ [1 2 2 3] ▽ [1 2 1] [1 2 3]
⍤⤙≍ [1 2 3 3] ▽ [1 1 2] [1 2 3]
⍤⤙≍ [1 1 1 2 2 3] ▽ [3 2 1] [1 2 3]
⍤⤙≍ [1 2 2 3 3 3] ˙▽[1 2 3]
⍤⤙≍ [1 2 2 3 3 3] ˙▽[0 1 2 3]
⍤⤙≍ [5 5 5 5 5] ˙▽5
⍤⤙≍ [1 1 1 1 2 3 3 5 6 6 8 9 9] ⬚[1 2 0]▽ [0 4] ⇡10
⍤⤙≍ [3_4 ∩₂5_6 ∩₃7_8] ▽ [0 1 2 3] [1_2 3_4 5_6 7_8]
⍤⤙≍ [∩₃1_2 ∩₂3_4 5_6] ▽ [3 2 1 0] [1_2 3_4 5_6 7_8]
⍤⤙≍ ⊃(▽⟜≡▽)▽₂ 1.5 °△3_3
⍤⤙≍ [5_6 1_2] ▽ ¯0.5 [1_2 3_4 5_6 7_8]
# Un keep
⍤⤙≍ {[1 1 2 1] "helo"} {°▽ "hello"}
⍤⤙≍ {[1 1 2] [1_2 3_4 1_2]} {°▽ [1_2 3_4 1_2 1_2]}
# Anti keep
⍤⤙≍ "ab-c" ⬚@-⌝▽ 1_1_0_1 "abc"
⍤⤙≍ "abc" ⌝▽ 1_1_1 "abc"
⍤⤙≍ "abc" ⬚@-⌝▽ 1_1_1 "abc"
⍤⤙≍ "abc" ⌝▽ 1_1_1_1_1 "abc"
⍤⤙≍ "a-b-c-d-e-f-g-" ⬚@-⌝▽ 1_0 "abcdefg"
⍤⤙≍ "ab-cd-ef-g" ⬚@-⌝▽ 1_1_0 "abcdefg"
⍤⤙≍ [1_2_3 0_0_0 4_5_6] ⬚0⌝▽ 1_0_1 [1_2_3 4_5_6]
⍤⤙≍ [1 0 2 0 3 0 4 0] ⬚0⌝▽ 1_0 [1 2 3 4]
⍤⤙≍ [5 0] ⬚0⌝▽ 1_0 5
⍤⤙≍ [1 3] ⌝▽ 2 [1 2 3 4]
⍤⤙≍ ⟜(⌝▽₂⟜▽₂ 3) °△2_2
⍤⤙≍ [4 5 5] ⌝▽ 2_2_1 4_4_5_5_5
⍤⤙≍ [4 5] ⌝▽ 2_3 4_4_5_5_5
⍤⤙≍ 1 ⍣⌝▽1 2_2_2_2 4_4_5_5_5_5_5
⍤⤙≍ "a bb" ⬚@ ⌝▽ 2_0_2_1 "aabbb"
# Regex
⍤⤙≍ [{"hello"} {"world"}] regex "[a-z]+" "hello world"
⍤⤙≍ ↯0_1 {} regex "[0-9]+" "hello world"
# Member of
⍤⤙≍ 1 ∊ [1 5 5] 5
⍤⤙≍ [1] ∊ [1 5 5] [5]
⍤⤙≍ 1 ∊ ↯3_4⇡12 [4 5 6 7]
⍤⤙≍ 0 ∊ ↯3_4⇡12 [6 3 2 2]
⍤⤙≍ [0 1 0] ∊ ↯3_4⇡12 6
⍤⤙≍ [0 1 1 1 0 1 0] ∊ [1 2 3] [0 1 2 3 4 W 5]
⍤⤙≍ [1 1] ∊ {"a\Wc" "ab\W" "bcd"} {"abc" "bcd"}
⍤⤙≍ ↯3 1 ∊ [1 2 W] [1 2 3]
⍤⤙≍ ↯3 1 ∊ [1 W 3] [1 2 3]
⍤⤙≍ ↯3 1 ∊ [W 2 3] [1 2 3]
⍤⤙≍ ⟜(△∊5 °△)2_4
⍤⤙≍ ⟜(△∊5 °△)1_4
⍤⤙≍ ⟜(△∊5 °△)0_4
⍤⤙≍ 0 ∊[¤1 ¤2] ¤5
⍤⤙≍ 0 ˜∊ ¯1 ⇡5
⍤⤙≍ 0 ˜∊ 5 ⇡5
⍤⤙≍ 0 ˜∊ 6 ⇡5
# Index in
⍤⤙≍ 1 ⨂ [1 5 5] 5
⍤⤙≍ [1] ⨂ [1 5 5] [5]
⍤⤙≍ 1 ⨂ ↯3_4⇡12 [4 5 6 7]
⍤⤙≍ 3 ⨂ ↯3_4⇡12 [6 3 2 2]
⍤⤙≍ [4 2 4] ⨂ ↯3_4⇡12 6
⍤⤙≍ [3 ∞1 ∞0] ⬚∞⨂ [1 2 3 4] [4 8 2 9 1]
⍤⤙≍ 0 ⨂ 5 5
⍤⤙≍ [3 0 1 2 3 0 3] ⨂ [1 2 3] [0 1 2 3 4 W 5]
⍤⤙≍ [0 2] ⨂ {"a\Wc" "ab\W" "bcd"} {"abc" "bcd"}
⍤⤙≍ [0 1 2] ⨂ [1 2 W] [1 2 3]
⍤⤙≍ [0 1 1] ⨂ [1 W 3] [1 2 3]
⍤⤙≍ [0 0 0] ⨂ [W 2 3] [1 2 3]
⍤⤙≍ ⟜(△⨂ 5 °△)2_4
⍤⤙≍ ⟜(△⨂ 5 °△)1_4
⍤⤙≍ ⟜(△⨂ 5 °△)0_4
⍤⤙≍ 1 ˜⨂ ¤5 [¤1 ¤5]
⍤⤙≍ 2 ˜⨂ ¤5 [[1] [2] [5] [3]]
⍤⤙≍ 4 ˜⨂ ¤5 [[1] [2] [0] [3]]
⍤⤙≍ 4 ˜⨂ ¤5 [1_0 2_0 5_0 3_0]
⍤⤙≍ 5 ⨂ ⇡5 ¯1
⍤⤙≍ 5 ⨂ ⇡5 5
⍤⤙≍ 5 ⨂ ⇡5 6
⍤⤙≍ ⬚¯1⨂ [1 2 1] 0 ⬚¯1⨂ [1 2 3] 0
# Find
⍤⤙≍ [0 1 0 0] ⌕ 2 [1 2 3 4]
⍤⤙≍ [0 1 0 0 1 0 0 0] ⌕ 1_2 [0 1 2 3 1 2 3 4]
⍤⤙≍ [0_1_0_0 1_0_0_0 0_0_1_0 0_0_0_0] ⌕ [1_2 2_0] ↯4_4⇡3
⍤⤙≍ [1 0 0 1 0 0] ⌕ "aba" "abaaba"
⍤⤙≍ [1 0 0 1 0 0 0] ⌕ "abba" "abbabba"
⍤⤙≍ [1 0 0 0 1 0 0 0] ⌕ "abba" "abbaabba"
⍤⤙≍ [0 0 0] ⌕ "abcdef" "abc"
⍤⤙≍ [0 0 0 0 0] ⌕ "abcdefgh" "wowee"
⍤⤙≍ [] ⌕ 0 []
⍤⤙≍ °△0_2 ⌕ 0 °△0_2
⍤⤙≍ ↯2_0e ⌕ 0 ↯2_0e
⍤⤙≍ [1 0 0 0 0 0 0 1 0 0 0] ⌕ "ab" "abracadabra"
⍤⤙≍ [0 0 1 0 0 0 0 0 0 1 0] ⌕ "ra" "abracadabra"
⍤⤙≍ ↯3⊚4 ⬚0⌕ ⇡4 °△ 3_2
⍤⤙≍ ↯3⊚4 ⬚0˜⌕⇡4 °△ 3_2
# Mask
⍤⤙≍ [0 1 0 0] ⦷ 2 [1 2 3 4]
⍤⤙≍ [0 1 1 0 2 2 0 0] ⦷ 1_2 [0 1 2 3 1 2 3 4]
⍤⤙≍ [0_1_1_0 0_1_1_0 0_0_2_2 0_0_2_2] ⦷ [1_2 2_0] ↯4_4⇡3
⍤⤙≍ [0 0 0] ⦷ "abcdef" "abc"
⍤⤙≍ [0 0 0 0 0] ⦷ "abcdefgh" "wowee"
⍤⤙≍ [0 0 0] ⦷ "" "abc"
⍤⤙≍ [] ⦷ 0 []
⍤⤙≍ °△0_2 ⦷ 0 °△0_2
⍤⤙≍ ↯2_0e ⦷ 0 ↯2_0e
⍤⤙≍ [1 1 0 0 0 0 0 2 2 0 0] ⦷ "ab" "abracadabra"
⍤⤙≍ [0 0 1 1 0 0 0 0 0 2 2] ⦷ "ra" "abracadabra"
# Join
⍤⤙≍ [3 5] ⊂ 3 5
⍤⤙≍ [1 2 3 4] ⊂ 1 2_3_4
⍤⤙≍ [1 2 3 4] ⊂ 1_2_3 4
⍤⤙≍ [0_0_0 0_1_2 3_4_5] ⊂ 0_0_0 ↯2_3⇡6
⍤⤙≍ [0_1_2 3_4_5 0_0_0] ⊂⊙0_0_0 ↯2_3⇡6
# Sided join
⍤⤙≍ [1 2] ⊂⌟ 1 2
⍤⤙≍ [1 2 3] ⊂⌟ 1_2 3
⍤⤙≍ [1_1 2_3] ⊂⌟ 1 2_3
⍤⤙≍ [1_2 3_4] ⊂⌟ 1_2 3_4
⍤⤙≍ [1_2 3_4 5_6] ⊂⌟ [1_2 3_4] 5_6
⍤⤙≍ [[1_2 1_2] [3_4 5_6]] ⊂⌟ 1_2 [3_4 5_6]
⍤⤙≍ [1 2] ⊂⌞ 1 2
⍤⤙≍ [1 2 3] ⊂⌞ 1 2_3
⍤⤙≍ [1_2 3_3] ⊂⌞ 1_2 3
⍤⤙≍ [1_2 3_4] ⊂⌞ 1_2 3_4
⍤⤙≍ [[1_2 3_4] [5_6 5_6]] ⊂⌞ [1_2 3_4] 5_6
⍤⤙≍ [1_2 3_4 5_6] ⊂⌞ 1_2 [3_4 5_6]
⍤⤙≍ {1 [2]} {°⊂⌞} [1 2]
⍤⤙≍ {[1] 2} {°⊂⌟} [1 2]
⍤⤙≍ {1 2_3} {°⊂⌞} [1 2 3]
⍤⤙≍ {1_2 3} {°⊂⌟} [1 2 3]
# Multi join
⍤⤙≍ [1_2 3_4 5_6 7_8] ⊂₃ 1_2 3_4 [5_6 7_8]
⍤⤙≍ [1_2 3_4 5_6 7_8] ⊂₃ [1_2 3_4] 5_6 7_8
⍤⤙≍ [1_2 3_4 5_6 7_8] ⊂₃ 1_2 [3_4 5_6] 7_8
⍤⤙≍ [1_1 2_3 4_5 6_7] ⊂₃ 1 2_3 [4_5 6_7]
⍤⤙≍ [1_2 3_3 4_5 6_7] ⊂₃ 1_2 3 [4_5 6_7]
⍤⤙≍ [1_2 3_4 5_6 7_7] ⊂₃ 1_2 [3_4 5_6] 7
⍤⤙≍ [1_1 2_3 4_5 6_7] ⊂₃ 1 [2_3 4_5] 6_7
⍤⤙≍ [1_2 3_4 5_5 6_7] ⊂₃ [1_2 3_4] 5 6_7
⍤⤙≍ [1_2 3_4 5_6 7_7] ⊂₃ [1_2 3_4] 5_6 7
# Unjoin
⍤⤙≍ {1 [2 3 4]} {°⊂ [1 2 3 4]}
⍤⤙≍ {0_1_2_3 [4_5_6_7 8_9_10_11]} {°⊂ ↯3_4⇡12}
⍤⤙≍ [2 3] °(⊂1) [1 2 3]
⍤⤙≍ [2 3] °(⊂[1]) [1 2 3]
⍤⤙≍ [3] °(⊂1_2) [1 2 3]
⍤⤙≍ {1 [2 3]} {°⊂ [1 2 3]}
⍤⤙≍ {1 2 [3]} {°(⊂⊟) [1 2 3]}
⍤⤙≍ {1 2 3 [4]} {°(⊂[⊙⊙∘]) [1 2 3 4]}
⍤⤙≍ {1 [2] [3 4]} {°(⊂⊂) [1 2 3 4]}
⍤⤙≍ ⟜(⊂⊙⊂ °(⊂⊙⊂)) [1 2 3 4]
⍤⤙≍ ⟜(⊂⊙⊂ °(⊂⊙(⊂?))) [1 2 3 4]
⍤⤙≍ ⟜(⊂⊙⊂ °(⊂?⊙⊂)) [1 2 3 4]
⍤⤙≍ {[2 3 4 5] 1} {°˜⊂ [1 2 3 4 5]}
⍤⤙≍ {[2 3 4 5] 1} {°˜(⊂?) [1 2 3 4 5]}
⍤⤙≍ {[2 3 4 5] 1} {°(˜⊂?) [1 2 3 4 5]}
⍤⤙≍ {°˜⊂ ⇡4} {°(°°˜⊂) ⇡4}
⍤⤙≍ ⟜(×2⊂ °(×2⊂)) [1 2 3]
⍤⤙≍ [6] °(⊂3_2°(⊂6)) 3_2
⍤⤙≍ [6] °(⊂3_2⌝⊂6) 3_2
F ← +1⊂1
G ← +1?⊂1
⍤⤙≍ ⊃°F°G [2 3 4]
F ← ⊂0 [⊙⊙∘]
⍤⤙≍ [1 2 3] [°F] F 1 2 3
# Couple
⍤⤙≍ [3 5] ⊟ 3 5
⍤⤙≍ [1_2 3_4] ⊟ 1_2 3_4
⍤⤙≍ [1_2 3_3] ⊟ 1_2 3
⍤⤙≍ [1_1 2_3] ⊟ 1 2_3
⍤⤙≍ [[1_2 3_4] [5_5 5_5]] ⊟ [1_2 3_4] 5
⍤⤙≍ [[1_2 3_4] [5_6 5_6]] ⊟ [1_2 3_4] 5_6
⍤⤙≍ [1_0 2_3] ⬚0⊟ 1 [2 3]
⍤⤙≍ [0_0 1_2 3_4] ⊟₃ 0 1_2 3_4
⍤⤙≍ [0_1 2_2 3_4] ⊟₃ 0_1 2 3_4
⍤⤙≍ [0_1 2_3 4_4] ⊟₃ 0_1 2_3 4
⍤⤙≍ [[0_0 0_0] [1_2 3_4] [5_6 7_8]] ⊟₃ 0 [1_2 3_4] [5_6 7_8]
⍤⤙≍ [[0_1 0_1] [2_3 4_5] [6_7 8_9]] ⊟₃ 0_1 [2_3 4_5] [6_7 8_9]
# Base
⍤⤙≍ ⊃⋯(⊥2) 105
⍤⤙≍ ⊃⋯(⊥2) ⇡10
⍤⤙≍ [15 15] ⊥16 255
⍤⤙≍ [0 0 1] ⊥16 256
⍤⤙≍ [1 12] ⊥[12 20] 145
⍤⤙≍ [11 1 3] ⊥[12 20 ∞] 743
⍤⤙≍ [3 13 6 6 1 4] ⬚10⊥[12 20] 999999
⍤⤙≍ [0 0 0 1] ⊥ 10 1000
⍤⤙≍ [1 0 0 1] ⊥ 10 1001
⍤⤙≍ ▽6_1 0_1 ⊥10 1e6
⍤⤙≍ ▽9_1 0_1 ⊥10 1e9
# Antibase
⍤⤙≍ 255 ⌝⊥16 [15 15]
⍤⤙≍ 256 ⌝⊥16 [0 0 1]
⍤⤙≍ 145 ⌝⊥[12 20] [1 12]
⍤⤙≍ 743 ⌝⊥[12 20 ∞] [11 1 3]
⍤⤙≍ 999999 ⌝⬚10⊥[12 20] [3 13 6 6 1 4]
# Experimental!
# Or
⍤⤙≍ NaN ∨ NaN NaN
⍤⤙≍ ∞ ∨ ∞ 0
⍤⤙≍ π ∨ π ∞
⍤⤙≍ ¯3 ∨ 3 ¯∞
# Bytes
⍤⤙≍ ⤙⍜bytes∘ "u32" 6
⍤⤙≍ ⤙⍜bytes∘ "f64" 6
⍤⤙≍ ⤙⍜bytes∘ "u32" [6]
⍤⤙≍ ⤙⍜bytes∘ "f64" [6]
⍤⤙≍ ⤙⍜bytes∘ "u32" [1 2 3]
⍤⤙≍ [1 2 3 4] ⌝bytes "u32" [[1 0 0 0] [2 0 0 0] [3 0 0 0] [4 0 0 0]]
⍤⤙≍ 6 ⌝bytes "f64" [0 0 0 0 0 0 24 64]