Add check that there are samples for each language

website/index/samples/sample.ecl.txt

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+F0 := IMDB.File_actors;
+CountActors := RECORD
+F0.ActorName;
+UNSIGNED C := COUNT(GROUP);
+END;
+MoviesIn := TABLE(F0,CountActors,ActorName);
+OUTPUT(TOPN(MoviesIn,100,-C));

website/index/samples/sample.flow9.txt

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+import material/material;
+
+export {
+	demoMakeHelloWorld(onClose : () -> void) -> Material;
+}
+
+demoMakeHelloWorld(onClose : () -> void) -> Material {
+	MCenter(
+		MLines2(
+			MText("Hello, world!", []),
+			MTextButton("CLOSE", onClose, [], [])
+		)
+	);
+}

website/index/samples/sample.lexon.txt

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+LEX Paid Escrow.
+LEXON: 0.2.12
+COMMENT: 3.f - an escrow that is controlled by a third party for a fee.
+“Payer” is a person.
+“Payee” is a person.
+“Arbiter” is a person.
+“Fee” is an amount.
+The Payer pays an Amount into escrow,
+appoints the Payee,
+appoints the Arbiter,
+and also fixes the Fee.
+CLAUSE: Pay Out.
+The Arbiter may pay from escrow the Fee to themselves,
+and afterwards pay the remainder of the escrow to the Payee.
+CLAUSE: Pay Back.
+The Arbiter may pay from escrow the Fee to themselves,
+and afterwards return the remainder of the escrow to the Payer.

website/index/samples/sample.liquid.txt

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+class Random < Liquid::Block
+  def initialize(tag_name, markup, tokens)
+     super
+     @rand = markup.to_i
+  end
+
+  def render(context)
+    value = rand(@rand)
+    super.sub('^^^', value.to_s)  # calling `super` returns the content of the block
+  end
+end
+
+Liquid::Template.register_tag('random', Random)
+text = " {% random 5 %} you have drawn number ^^^, lucky you! {% endrandom %} "
+@template = Liquid::Template.parse(text)
+@template.render  # will return "you have drawn number 1, lucky you!" in 20% of cases

website/index/samples/sample.m3.txt

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+ MODULE HelloWorld EXPORTS Main;
+ FROM IO IMPORT Put;
+ BEGIN
+   Put("Hello World\n")
+ END HelloWorld.

website/index/samples/sample.pla.txt

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+.ob out1 out2 out3
+--1--     -        wait     110000
+.ilb in1 in0 wait ack nack
+.symbolic state<3> state<2>;aaa bbb; # comment

website/index/samples/sample.proto.txt

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+syntax = "proto3";
+import public "other.proto";
+
+/* SearchRequest represents a search query, with pagination options to
+ * indicate which results to include in the response. */
+
+message SearchRequest {
+  required string query = 1;
+  optional int32 page_number = 2;  // Which page number do we want?
+  optional int32 result_per_page = 3;  // Number of results to return per page.
+}

website/index/samples/sample.qsharp.txt

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+// Run this cell using Ctrl+Enter (⌘+Enter on Mac)
+// Then run the next cell to see the output
+
+open Microsoft.Quantum.Diagnostics;
+
+operation QubitsDemo () : Unit {
+    // This line allocates a qubit in state |0⟩
+    use q = Qubit();
+    Message("State |0⟩:");
+
+    // This line prints out the state of the quantum computer
+    // Since only one qubit is allocated, only its state is printed
+    DumpMachine();
+
+    // This line changes the qubit from state |0⟩ to state |1⟩
+    X(q);
+
+    Message("State |1⟩:");
+    DumpMachine();
+
+    // This line changes the qubit to state |-⟩ = (1/sqrt(2))(|0⟩ - |1⟩)
+    // That is, this puts the qubit into a superposition
+    // 1/sqrt(2) is approximately 0.707107
+    H(q);
+
+    Message("State |-⟩:");
+    DumpMachine();
+
+    // This line changes the qubit to state |-i⟩ = (1/sqrt(2))(|0⟩ - i|1⟩)
+    S(q);
+
+    Message("State |-i⟩:");
+    DumpMachine();
+
+    // This will put the qubit into an uneven superposition,
+    // where the amplitudes of |0⟩ and |1⟩ have different moduli
+    Rx(2.0, q);
+    Ry(1.0, q);
+
+    Message("Uneven superposition state:");
+    DumpMachine();
+
+    // This line returns the qubit to state |0⟩
+    Reset(q);
+}

website/index/samples/sample.sparql.txt

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+  SELECT ?x ?name
+  {
+    ?x  foaf:mbox <mailto:alice@example> .
+    ?x  foaf:knows ?a1 .
+    ?a1 foaf:knows ?a2 .
+    ?a2 foaf:name ?name .
+  }