KernelTileWitness.four_head: def of stelliferous@0.0.2.0
Import: import stelliferous@0.0.2.0/proofs/kernel_tile_witness.bend as KernelTileWitness
Lines 48-58 of stelliferous@0.0.2.0/proofs/kernel_tile_witness.bend: https://jend.leeeet.dev/read.txt?path=stelliferous@0.0.2.0/proofs/kernel_tile_witness.bend&start_line=48&end_line=58

import Base
import stelliferous@0.0.2.0/kernel_block.bend as Block
import stelliferous@0.0.2.0/kernel_tile.bend as Tile
import stelliferous@0.0.2.0/proofs/traversal_witness.bend as TraversalWitness

def four_head(~State: Type,~Context: Data,~Evidence: @-state: State -> Data,
  ~read: State -> Context -> Nat -> State & F32,
  ~read_preserves: @-state: State -> @context: Context -> @index: Nat -> Evidence(state) -> TraversalWitness.Sample<State,F32,state,read(state,context,index)>,
  -state: State,+context: Context,-head: F32,+index: Nat,+evidence: Evidence(state)) ->
  TraversalWitness.Sample<State,Block.Twin<Block.Twin<F32>>,state,
    Block.read_pair(~State,~Tile.HeadContext<Context>,~Block.Twin<F32>,
      ~Block.read_pair(~State,~Tile.HeadContext<Context>,~F32,~Tile.read_with_head(~State,~Context,~read),~1n),~2n,state,Tile.HeadContext{head,context},index)>:
  pair(~State,~Tile.HeadContext<Context>,~Block.Twin<F32>,
    ~Block.read_pair(~State,~Tile.HeadContext<Context>,~F32,~Tile.read_with_head(~State,~Context,~read),~1n),~2n,state,Tile.HeadContext{head,context},index,
    pair_head(~State,~Context,~Evidence,~read,~read_preserves,state,context,head,index,evidence),
    pair_head(~State,~Context,~Evidence,~read,~read_preserves,state,context,head,Nat.add(index,2n),evidence))

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/kernel_block.bend&name=Twin
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/kernel_block.bend&name=read_pair
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/kernel_tile.bend&name=HeadContext
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/kernel_tile.bend&name=read_with_head
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/proofs/kernel_tile_witness.bend&name=pair
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/proofs/kernel_tile_witness.bend&name=pair_head
  https://jend.leeeet.dev/definition.txt?path=stelliferous@0.0.2.0/proofs/traversal_witness.bend&name=Sample