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∇ R←M COMBIN N;D;E;F;G;P
⍝ Returns a matrix of every possible
⍝ combination of M elements from the
⍝ vector ⍳N. That is, returns a
⍝ matrix with M!N rows and N columns.
⍝
E←(⍳P←N-R←M-1)-⎕IO
D←R+⍳P
R←(P,1)⍴D
P←P⍴1
L1:→(⎕IO>1↑D←D-1)⍴0
P←+\P
G←+\¯1↓0,F←⌽P
E←F/E-G
R←(F/D),R[E+⍳⍴E;]
E←G
→L1
∇
∇ R←M QUICKEXP N
⍝ Matrix exponentiation
B ← ⌊ 1 + 2 ⍟ N
V ← (B ⍴ 2) ⊤ N
L ← ⊂ M
R ← ⊃ +.× / V / L ⊣ { L ← (⊂ A +.× A ← ↑L) , L }¨ ⍳ B-1
∇
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