Wave function collapse

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Write the solution for Wave Function Collapse based on the Coding Challenge 171: Wave Function Collapse and create new map 8x8 tiles with fourth T-blocks with variously directions (┤ ┴ ┬ ├) or blank tiles (space).

Reference WFC explained and another WFC explained

J

Implementation:<lang J>tiles=: 0,(|.@|:)^:(i.4)0,1 1 1,:0 1 0 wfc=: Template:M=.</lang>

Task example (the initial tiles and two runs of wave function collapse (two, to illustrate randomness):<lang J> (<"2) 1j1#"1 ' #'{~ tiles ┌──────┬──────┬──────┬──────┬──────┐ │ │ │ # │ # │ # │ │ │# # # │ # # │# # # │# # │ │ │ # │ # │ │ # │ └──────┴──────┴──────┴──────┴──────┘

  1j1#"1 ' #'{~ tiles wfc 8 8
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       #     #     #     #     #     #     #   
 #           #                 #     #         

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1. # # # # # # # # # # # # # # # # # # #

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  1j1#"1 ' #'{~ tiles wfc 8 8
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1. # # # # # # # # # # # # # # # # # #

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1. # # # # # # # # # # # # # #

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1. # # # # # # # # # #

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             #     #     #           #     #   </lang>