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#APL+WIN, 16 bytes
Prompts for vector of integers
+/2 4[(3 5⍳⎕)~3]
Try it online! Courtesy of Dyalog Classic
#APL+WIN, 2116 bytes
+/2 4[(3 5⍳n5⍳⎕)~1+⍴n←⎕]~3]
Try it online! Courtesy of Dyalog ClassicTry it online! Courtesy of Dyalog Classic
#APL+WIN, 21 bytes
+/2 4[(3 5⍳n)~1+⍴n←⎕]
