Chain extensions in @extend in SASS

The @extend directive also supports chained (sequential) extension, i.e. a selector can be extended by another selector, which in turn is extended by a third selector. For example:

Let's look at an example:

.warning {
	border: 1px solid;
	background-color: #ffd900;
}
.personalWarning {
	@extend .warning;
	border-width: 3px;
}
.systemWarning {
	@extend .personalWarning;
	position: center;
}

As we can see from the compilation result, all elements with the class .systemWarning also have the styles of the classes .warning and .personalWarning:

.warning, .personalWarning, .systemWarning {
	border: 1px solid;
	background-color: #ffd900;
}
.personalWarning, .systemWarning {
	border-width: 3px;
}
.systemWarning {
	position: center;
}

Tell me what the result of compiling the following code will be:

div {
	font-size: 10px;
	color: #181402;
}

.main-block {
	@extend div;
	border: 2px solid orange;
}

#warning-text {
	@extend .main-block;
	margin-top: 10px;
}

Tell me what the result of compiling the following code will be:

p {
	padding: 10px;
}

.main-text {
	font-weight: 800px;
}

.card {
	@extend p;
	color: #021338;
}

.product-card {
	@extend .card, .main-text;
	font-size: 12px;
}

Tell me what the result of compiling the following code will be:

p {
	padding: 5px;
}

.main-text {
	@extend p;
	font-size: 14px;
}

.card {
	@extend .main-text;
	border: 1px solid black;
}

.product-card {
	@extend .card;
	background-color: #e1f1f1;
}