add and use relateSeq_iff_exists_Vector #733

	# based on https://github.com/leanprover-community/lean-liquid/blob/master/.github/workflow/build.yml

	on:
	push:

	name: CI

	jobs:

	build:
	name: Build PDL
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: ${{ env.GIT_HISTORY_DEPTH }}

	- name: install elan
	run: \|
	set -o pipefail
	curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf \| sh -s -- --default-toolchain none -y
	~/.elan/bin/lean --version
	echo "$HOME/.elan/bin" >> $GITHUB_PATH

	- name: make pdl
	run: make pdl

	bml:
	name: Build BML
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: ${{ env.GIT_HISTORY_DEPTH }}

	- name: install elan
	run: \|
	set -o pipefail
	curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf \| sh -s -- --default-toolchain none -y
	~/.elan/bin/lean --version
	echo "$HOME/.elan/bin" >> $GITHUB_PATH

	- name: make bml
	run: make bml

	stats:
	name: Stats
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: install ripgrep
	run: sudo apt install -y ripgrep

	- name: PDL count lines in src
	run: \|
	shopt -s globstar
	wc -l Pdl/*/.lean
	- name: PDL count sorries
	run: \|
	rg --count-matches sorry Pdl \| awk -F ':' 'BEGIN {sum = 0} {sum += $2} {print $2 " " $1} END {print sum " sorries in total"}'

	- name: BML count lines in src
	run: \|
	shopt -s globstar
	wc -l Bml/*/.lean
	- name: BML count sorries
	run: \|
	rg --count-matches sorry Bml \| awk -F ':' 'BEGIN {sum = 0} {sum += $2} {print $2 " " $1} END {print sum " sorries in total"}'

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